Feb. 5, 2024
S27E16: Our Shrinking Moon
The Space, Astronomy and Science Podcast. SpaceTime Series 27 Episode 16 *The Moon is shrinking A new study has confirmed earlier research showing that the Earth’s moon is shrinking causing landslides and instability around the lunar south pole. *NASA...
The Space, Astronomy and Science Podcast. SpaceTime Series 27 Episode 16 *The Moon is shrinking A new study has confirmed earlier research showing that the Earth’s moon is shrinking causing landslides and instability around the lunar south pole. *NASA analysis confirms 2023 as warmest year on record A new analysis by NASA has confirmed that planet Earth’s average surface temperature in 2023 was the warmest on record. *Stars travel more slowly at Milky Way’s edge By clocking the speed of stars throughout the Milky Way galaxy, physicists have found that stars further out in the galactic disk are traveling more slowly than expected compared to stars that are closer to the galaxy’s centre. *The Science Report People who sit for prolonged periods at work have a 16% higher risk of death. Claims average global temperatures have already risen by 1.5°C above pre-industrial levels. Outdoor artificial light at night could be linked to an increased risk of a kind of macular degeneration. Skeptics guide to Bedfordshire hotbed of supernatural activity https://spacetimewithstuartgary.com https://bitesz.com This week’s guests: Planetary scientist Simon O'Toole from Macquarie University Gavin Schmidt The director NASA’s Goddard Institute for Space Studies And our regular guests: Alex Zaharov-Reutt from techadvice.life Tim Mendham from Australian Skeptics 🌏 Get Our Exclusive NordVPN deal here ➼ https://nordvpn.com/stuartgary or use the checkout code STUARTGARY. It’s risk-free with Nord’s 30-day money-back guarantee! ✌ Listen to SpaceTime on your favorite podcast app with our universal listen link: https://spacetimewithstuartgary.com/listen and access show links via https://linktr.ee/biteszHQ For more podcasts visit our HQ at https://bitesz.com
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The Astronomy, Space, Technology & Science News Podcast.
WEBVTT
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This is Spacetime Series twenty seven,
episode sixteen, or broadcast on the fifth
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of February twenty twenty four. Coming
up on Space Time, the Earth's Moon
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is shrinking and that means moonquakes for
astronauts. NASA's analysis confirms World Meteorological Organization
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figures showing that twenty twenty three was
the war misteir on record, and a
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new study indicates that stars travel more
slowly around the edge of the Milky Way.
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All that and more coming up on
space Time Welcome to Space Time with
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Stuart Gary. A new study has
confirmed earlier research showing that the Earth's Moon
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is shrinking and that it's causing landslides, instability, and moonquakes around the lunar
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South Pole. Scientists say the findings
will have consequences for the astronauts destined to
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explore and ultimately colonize this part of
the lunar's surface. The study, reported
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in the Planetary Science Journal As shown
that the Moon shrank more than forty six
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meters in circumference as it's called gradually
cooled over the last few hundred million years,
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in much the same way as a
grape will wrinkle as it shrinks down
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to become a raisin. The Moon
also develops creases as it shrinks, but
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unlike the flexible skin on a grape, the moon surface is brittle, causing
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falseter form where sections of crust pushed
past one another. Importantly, scientists of
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Nardis covered evidence that this shrinking of
the Moon's surface has led to notable surface
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warping near the lunar South Pole.
That's the region where NASA plans on landing
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its manned Artemis three mission in two
years time. In fact, because of
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the South Pole's easy access to water, although in a frozen state deep on
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the floors of permanently shaded craters,
the South Pole will become the likely main
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colonization point for future lunar missions to
the lunar surface. The problem is fault
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formation caused by the moon shrinkage is
often accompanied by searsmic activity like moonquakes,
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and locations within or in these such
fault zones could post dangers for future human
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exploration efforts. The authors have already
linked one group of forts located near the
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moon south Pole region to one of
the most powerful moonquakes ever recorded by the
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Apollo seismometers more than fifty years ago. Using models to simulate the stability of
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surface slopes within that region. Site
has found that some areas were especially vulnerable
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to landslides from seismic shaking. The
studies lead author Thomas Waters from the National
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Air and Space Museum set for Earthen
Planetary Studies, says the modeling suggests that
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shallow moonquakes capable of bridge using strong
ground checking in the South Pole region are
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possible from slip events on existing faults
or the formation of new thrust faults.
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He warns that the lunar global distribution
of young thrust faults, their potential to
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be active, and the potential to
form new thrust faults from ongoing global contraction
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should be considered when planning the location
and stability of permanent outposts on the Moon.
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The study suggest that shallow moonquakes occur
near the surface of the Moon,
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just one hundred of circular meters deep
into the crust. Similar to earthquakes,
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shallow moonquakes are caused by faults in
the lunar interior, and they can be
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strong enough to damage buildings, equipment, and other human made structures. But
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importantly, unlike earthquakes, which tend
to only last a few seconds or minutes,
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shallow moonquakes can last for hours,
even a whole afternoon. It means
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if we're not careful, shallow moonquakes
could devastate any future human settlements on the
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Moon. These new findings will help
prepare humans for it awaits them when they
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do move to the Moon, and
that needs to include engineering structures so they
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can better withstand Luna seismic activity,
thereby protecting people in the danger zones this
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space time still to come. A
new NASA analysis confirms the World Meteorological Organization's
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figures that show twenty twenty three was
the warmest Yuron record, and a new
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study shows that stars tend to travel
more slowly along the outer edge of the
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Milky Way Galaxy. All that and
more still to come on space time.
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A new NASA analysis has confirmed data
by the World Meteorological Organization that planetarth average
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surface temperature in twenty twenty three was
the stone record. Their data shows global
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temperatures last year were around one point
two degrees celsius above the average for NASA's
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baseline period, which is between nineteen
fifty one and nineteen eighty. NASA Administrator
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Bill Nilson says the studies by both
NASA and NOAH. The National Oceanographic and
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Atmospheric Administration clearly confirms that planet Earth
is facing a climate crisis. In twenty
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twenty three, hundreds of millions of
people around the world experienced extreme heat,
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and each month from June through to
December last year set a new global record
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for that respective month, and July
ended up being the hottest month ever recorded.
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Overall, planet Earth was about one
point four degrees celsius warmer in twenty
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twenty three than it was during the
late nineteenth century average that's when modern record
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keeping began. Meanwhile, the director
of NASA's god At Institute for Space Studies,
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Gavin Schmidt, says the exceptional warming
isn't something that we've seen before in
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human history. He says it is
being driven primarily by fossil fuel emissions,
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and we're seeing the impacts of this
in heat waves, intense rainfall, and
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coastal flooding. Those scientists have conclusive
evidence that the planet's long term warming trend
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is driven by human activity. They're
still examining other phenomena that could be affecting
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yearly or multi yearly changes in climate, such as el Nina aerosols and pollution,
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and volcanic eruptions. Now typically,
the largest source of yety of variability
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on Earth is the Al Nino Southern
Oscillation Index. It's a climate pattern based
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around the Pacific Ocean. The pattern
has two phases, El Nino and Lininia.
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During these phases, see surface temperatures
in the Pacific along the equator tend
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to switch between warmer average and cool
at temperatures. Now, what's been unusual
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of late is that between twenty twenty
and twenty twenty two, the Pacific Ocean
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saw three consecutive Linina events, which
tend to cool global temperatures. Then,
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in May twenty twenty three, the
ocean transition from La Nina to El Nino,
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which often coincides with the hottest Jees
on record. However, the record
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temperatures in the second half of twenty
twenty three occurred before the peg of the
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current El Nino event, and scientists
say they now expect to see the biggest
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impacts of El Nina over the next
three months. But it's not just El
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Nino. Scientists have also been investigating
the possible impacts of the January twenty twenty
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two eruption of the Hunger tonguahunga Ape
under sea volcano, which blasted water,
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vapor, and fine particles and aerosols
high into the stratosphere. A recent study
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found that the volcanic aerosols, by
reflecting sunlight away from the Earth's surface,
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actually led to an overall slight cooling
of the planet by about zero point one
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degree celsius that was mainly restricted to
the southern hemisphere. Immediately following the eruption,
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Nasaus symbols at surface temperature records using
air temperature data colling did from tens
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of thousands of meteorological stations. There's
also sea surface temperature data acquired either by
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ship or booy based instruments. All
this data is then analyzed using methods that
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account for varied spacing of temperature stations
around the globe and for things like the
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urban heat effect, they could be
skewing calculations. Independent analyzes by NOAH and
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by the Hadley Center, which is
part of the United Kingdom's Met Office,
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have also concluded that global surface temperatures
for twenty twenty three were the highest since
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modern record keeping began. Now,
while these scientists are all using the same
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temperature data in their analysis. They're
using different methodologies, yet they're arriving at
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the same conclusions. Although rankings can
be slightly different between the records, they're
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still all in broad agreement and they
clearly show that some ongoing, long term
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warming is taking place and has been
doing so over recent decades. This report
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from NASTV twenty twenty three was the
hottest year on record by a large margin.
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But why does NASA, a space
agency, even look at Earth's temperature
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record. Let's start from the beginning. NASA's Goddard Institute for Space Studies or
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GIS, creates the global temperature record
using land and ocean surface data collected from
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thousands of instruments and boobies around the
world. But this critical data set of
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Earth's temperature has an origin story that
starts one hundred million miles away on planet
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Venus. It's nine hundred degrees hot
of the surface, has powerful high altitude
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winds, and is blanketed by a
dense carbon dioxide. The GARDIS Suit for
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Space Study here in New York was
set up in the early nineteen sixties to
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provide a connection between NASA and the
academic community, and so it was very
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much an ideas shop, and so
we spent a lot of time with the
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formation of galaxies and black holes and
panetary program and Voyager, and we were
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involved very early on in some of
the missions to Venus and Jupiter. Back
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then, when GIFs researchers were studying
the weather on Venus, scientists noticed something
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fascinating. A thick atmosphere made up
of clouds and carbon dioxide was trapping heat,
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so much heat that Venus had a
surface hot enough to melt lead.
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This trapping of heat is known as
the greenhouse gas effect. One of the
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lead Venus researchers, I guess doctor
James Hansen, realized that greenhouse gases were
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also building up an Earth's atmosphere,
so he switched his sights to his home
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planet and pledged to model the changing
atmosphere of Earth and to verify our ground
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truth. As model, he needed
real world measurements over time, so he
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began keeping track of Earth's global temperature
record dating back to eighteen eighty When there
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was a sufficient amount of data to
pull from, we used our expertise in
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understanding literally the clouds of Venus and
the clouds and dynamics of Jupiter, and
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then we took that and we started
to think about how you would do the
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same thing for the Earth. Since
then, Guests has kept at sights on
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the global temperature record, and that
was the birth of Gifts as a climate
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modeling institution, and scientists have seen
a clear trend in that record rising temperatures,
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and they know why. The key
difference between say, this decade and
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the decade before and the decade before
that, is that the temperatures have been
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rising because of our activities, because
of principally the burning of fossil fuels.
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Without the presence of humans, Earth's
temperature would rise and fall due to a
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complex array of natural drivers. With
human presence, however, the temperature just
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continues to rise. We know that
by observing temperature anomalies. Measuring temperature anomalies
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means that we look at the change
over time rather than absolute temperatures. The
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data map isn't showing that the Arctic
style warmer temperatures than the tropics. It's
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saying the Arctic was that much warmer
than the Arctic has been in previous years,
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which is an anomaly in Arctic temperatures. But how do we get those
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anomaly measurements Let's say you want to
track if apples these days are generally larger,
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smaller, or the same size as
they were twenty years ago. In
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other words, you want to track
the change over time. Imagine each person
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on your apple measuring team has their
own food scale. Person A measures apple
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one and their food scale rates six
ounces. Person B measures the same apple,
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but their scale reads seven ounces.
Since these scales are calibrated differently,
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your team ended up with two different
recorded weights for the same exact apple.
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There's some imprecision in the measurements,
and to account for that when you compare
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this apple's measurement to the apples growing
next year, you'll need to look at
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their difference rather than absolute weights,
focusing on the anomaly, or how much
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heavier or lighter than next apple is
from year to year. So for temperatures,
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while it would be great to have
the same exact scale or thermometer all
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over the world measuring the temperature in
the same exact way, we don't.
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Instead we focus on how much warmer
or colder the temperatures are in each place,
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based on their own instruments. Another
factor to consider is, since you're
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tracking apples from all over the globe, there are differences in baseline weights.
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Let's say apples grown in Florida are
generally larger than apples grown in Alaska.
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Like in real life, how Floridian
temperatures are generally much higher than Alaskan temperatures.
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So how do you track the change
in apple size is from apples grown
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all over the world while still accounting
for their different baseline weights by focusing on
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the difference within each area rather than
the absolute weights. So when it comes
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to the temperature record, scientists aren't
comparing temperatures in Bermuda to temperatures in Greenland
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and averaging them together for net warming. Instead, they're comparing the change in
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temperatures in Bermuda to the change in
temperatures in Greenland. Again, we look
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at the anomaly measurements to track the
change over time. Now let's scale this
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example up. If you have a
weather station that's say here in New York
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City, and you compare it to
a weather station in Washington, d C.
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Or Montreal, they tell very different
stories about the absolute temperature. Right,
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So Montreal is colder and the Washington
d C Is often warmer. But
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when they move up and down,
when there's a month that is warmer or
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colder, it's basically the same in
all three locations. And so by looking
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at the anomalies how much warmer it
is than normal for that particular point,
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and then you look at those anomalies
at all those different points and you can
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average those. It turns out that
you can fill out the gaps much more
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effectively. This big picture global temperature
is comprised of much smaller concentrated data points
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from all over the world. So
while globally temperatures average out to be record
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hot, it wasn't record hot in
every single location around the world. But
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why did twenty twenty three see record
heat? Well, to put it simply,
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a combination of high greenhouse gas emissions
and the transition out of three consecutive
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years of Lannina conditions and into al
Nino conditions led to record breaking heat,
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But the year was in some respects
still surprisingly hot, and NASA is continuing
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its research on why. Typically the
largest cause of short term year to year
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differences in temperature is usually La Nina
and al Nina weather patterns. Laninia generally
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cools things down while warms them up. The largest cause of long term decade
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by decade differences in temperature is greenhouse
gas emissions and the subsequent trapped heat by
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greenhouse gases. So while we don't
expect every year to be a new record
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like twenty twenty three, we do
expect new records as long as we continue
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to increase greenhouse gas emissions. The
key thing to take away from all of
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this is that the long term trends
are pretty much relentlessly up. We're going
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to continue to have records be broken
because that baseline is moving all the time,
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and then the weather is sitting on
top of that, and so when
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the weather is warmer than normal,
then we're going to get these records.
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But even when it's cooled in the
normal, we don't go back to what
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it was. And in that report
from That's a TV, we heard from
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Gavin Schmidt, the director of NASA's
got Out Institute for Space Studies, this
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space Time Still to Come a you
study show stars travel more slowly around the
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edge of the Milky Way galaxy,
and later in the science report, your
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research shows that people who sit for
long periods of time at work have a
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sixty percent higher risk of death.
All that are more still to come on
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space time By clocking the speed of
stars throughout the Milky Way Galaxy, physicists
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have discovered that stars further out on
the galactic disc are traveling more slowly than
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expected compaired to stars that are closer
to the galaxy center. The findings,
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reported in the Monthly Notices of the
Royal Astronomical Society's Journal, erasing the possible
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ability that the Milky Wate gravitational core
may be lighter in mass and contain less
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dark matter than previously thought. The
new results are based on an analysis of
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data taken by both the GYA and
APERGE instruments. GIA is an orbiting space
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telescope run by the European Space Agency. It's tracking the precise location, distance
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and motion of more than a billion
stars throughout the Milky Way Galaxy. Meanwhile,
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APERGY is a ground based survey telescope. The physicist analyzed GUIAS measurements of
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more than thirty three thousand stars,
including some of the furthest stars in the
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galaxy, and they determined eight stars
circular velocity. Now, circular velocity is
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how fast the star is circling the
galactic disc given the stars distance from the
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galactic center. The authors then plotted
each star's velocity against its distance to generate
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a rotational curve. It's a standard
graphic astronomy representing how fast matters rotating at
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at given distance from the center of
a galaxy. The shape of this curve
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and gives scientists an idea of how
much visible and dark matter is distributed throughout
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the galaxy. One of the studies
authors, Lena A. KiB from the
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Massachusetts Institute of Technology MIT, says
what really surprised the authors was that this
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curve remained flat, and it continued
to stay flat all the way out to
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a certain distance, and then it
suddenly started tanking away. This means the
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outer stars of the galaxy are rotating
a little slower than expected, which is
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a very surprising result. The authors
then translated this new rotational curve to a
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00:19:34.839 --> 00:19:41.279
distribution of dark matter that could explain
the outer stars slow down. They found
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the resulting map ended up producing a
lighter galactic core than what was expected.
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In other words, the center of
the Milky Way galaxy might be less dense
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with less dark matter than what astronomers
had always thought. The new results,
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00:19:55.240 --> 00:20:00.079
therefore, are in clear tension with
other measurements. The authors say there's something
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00:20:00.119 --> 00:20:03.880
fishy going on somewhere. Like most
galaxies in the universe, our milky Way
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spins, I guess sort of like
water at a whirlpool, and its rotation
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00:20:08.039 --> 00:20:12.400
is driven in part by all the
matter that's swirling within the disk. It
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00:20:12.519 --> 00:20:18.759
was back in the nineteen seventies when
astronomer Verra Ruben became the first to observe
227
00:20:18.960 --> 00:20:22.279
that galaxies rotate in a way that
cannot be purely driven by their visible matter.
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00:20:23.000 --> 00:20:27.240
Ruben and colleagues measured the circular velocity
of stars and found that the resulting
229
00:20:27.359 --> 00:20:33.079
rotational curves were surprisingly flat. That
is, the velocity of the stars going
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00:20:33.079 --> 00:20:37.200
around the center remained the same throughout
the galaxy, whether or not they were
231
00:20:37.200 --> 00:20:41.240
close to the center or out near
the edge. Their rotational curves weren't dropping
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off with distance. Rubon and colleagues
concluded that some other type of invisible matter,
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00:20:47.920 --> 00:20:51.960
stuff we now call dark matter,
must be acting on distant stars to
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00:20:52.000 --> 00:20:56.359
give them an additional push. In
this regard, Ruben's work in rotation curves
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00:20:56.519 --> 00:21:00.799
was one of the first strong pieces
of evidence for them in the existence of
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00:21:00.880 --> 00:21:04.880
dark matter, an invisible, unknown
entity which we know exists and must make
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00:21:04.960 --> 00:21:10.559
up more than three quarters of all
the matter in the universe. Since then,
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00:21:10.680 --> 00:21:15.599
astronomers have observed similar flat curves in
other far off galaxies, further supporting
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00:21:15.680 --> 00:21:19.839
dark matters presence. But only recently
of astronomers attempted to chart the rotation curve
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in our own galaxy with stars,
and it turns out it's a lot harder
241
00:21:25.200 --> 00:21:29.680
to measure the rotational curve when you're
actually sitting deep inside the galaxy. Back
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00:21:29.720 --> 00:21:33.920
in twenty nineteen, Anachristina Elliots from
MIT worked to chart the Milky Way's rotation
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00:21:34.079 --> 00:21:38.640
curve using an earlier batch of data
release by Geyer. Now that data release
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00:21:38.680 --> 00:21:42.920
included stars as farret as twenty five
Killer Parssex, which is about eighty one
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00:21:44.039 --> 00:21:48.440
thousand light years from the galaxy center. Now, based on these data,
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00:21:48.559 --> 00:21:52.759
Elliots observed that the Milky Way's rotation
curve appeared to be flat, although with
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00:21:52.839 --> 00:21:56.279
a mild decline, similar to other
far off galaxies, and by inference,
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our galaxy likely bore a high day
density of dark matter at its core.
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00:22:02.480 --> 00:22:06.079
But this view is now shifted as
guys released a new batch of data,
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00:22:06.160 --> 00:22:10.160
this time including stars as far at
as thirty kilo Parssex. That's almost one
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00:22:10.200 --> 00:22:15.480
hundred thousand light years from the galaxy's
core. Now these distances, astronomers are
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looking right at the edge of our
galaxy, the place where stars are starting
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to peter out. No one's ever
explored how much matter moves around in this
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00:22:22.680 --> 00:22:29.319
outer galaxy region. It's where we're
really starting to touch the nothingness of intergalactic
255
00:22:29.400 --> 00:22:33.519
space. So as you can imagine, the studies authors jumped on Guys' latest
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00:22:33.559 --> 00:22:37.480
data at least late last year,
looking to expand on at least initial rotation
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00:22:37.680 --> 00:22:41.720
curve. To refine their analysis.
They complemented the gay A telescope data with
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00:22:41.839 --> 00:22:48.119
measurements by APERGEY, the Apergey Point
Observatory Galactic Evolution Experiment. It's measuring extremely
259
00:22:48.200 --> 00:22:52.240
detailed properties of more than seven hundred
thousand stars in the Milky Way, such
260
00:22:52.240 --> 00:22:57.000
as their brightness, their temperature,
and their elemental composition. The data is
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00:22:57.039 --> 00:23:02.880
then fit into an algorithm try and
learn connections that can give scientists a better
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00:23:03.000 --> 00:23:07.720
estimate of a star's distance. The
authors use this data to establish a precise
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00:23:07.799 --> 00:23:11.119
distance system more than thirty three thousand
stars, and use these measurements to generate
264
00:23:11.160 --> 00:23:15.279
a three dimensional map of the stars
scattered across the Milky Way out to around
265
00:23:15.359 --> 00:23:21.680
thirty kilo Parssex. They then incorporated
this vast map into a model of circular
266
00:23:21.759 --> 00:23:26.119
velocity in order to simulate how fast
any one star must be traveling given the
267
00:23:26.160 --> 00:23:30.440
distribution of all the other stars in
the galaxy. They then plotted each star's
268
00:23:30.519 --> 00:23:34.079
velocity and distance on a chart in
order to produce an updated rotation curve of
269
00:23:34.119 --> 00:23:40.480
the whole Milky Way itself, and
that is where the weirdnesses come in.
270
00:23:40.480 --> 00:23:44.960
Instead of seeing a mild decline like
previous rotation curves, the authors observed that
271
00:23:45.039 --> 00:23:48.759
this new curve get far more strongly
than expected at the utter end. Now,
272
00:23:48.759 --> 00:23:53.319
this unexpected downturn suggest that while stars
may be traveling just as fast out
273
00:23:53.359 --> 00:23:59.319
to a certain distance, they then
suddenly slow down beyond this distance. When
274
00:23:59.319 --> 00:24:03.440
the team transition this rotation curve to
the amount of dark matter that must exist
275
00:24:03.440 --> 00:24:07.920
throughout the galaxy, they found that
the Milky Waiste core must contain far less
276
00:24:07.000 --> 00:24:11.920
dark matter than what they had previously
estimated. The result is clearly intension,
277
00:24:12.000 --> 00:24:18.920
with other measurements. Really understanding the
meaning of this result will undoubtedly have debrief
278
00:24:18.920 --> 00:24:22.440
percussions. This could simply be leading
to more hidden masses just beyond the edge
279
00:24:22.480 --> 00:24:26.599
of the galactic disk, or could
mean a total reconsideration of the state of
280
00:24:26.680 --> 00:24:32.200
the equilibrium of our galaxy. You
can be sure of one thing, whatever
281
00:24:32.319 --> 00:24:52.240
unfolds will be fascinating. This is
space time. Time out to take a
282
00:24:52.240 --> 00:24:56.440
brief look at some of the other
stories making use in science this week with
283
00:24:56.519 --> 00:25:00.079
a science report. A new study
has shown that people who sit for prolonged
284
00:25:00.079 --> 00:25:04.359
periods of time at work wind up
having a sixteen percent higher risk of death
285
00:25:04.359 --> 00:25:08.960
from any cause and a thirty four
percent higher risk of heart disease. The
286
00:25:10.039 --> 00:25:14.640
findings were reported in the Journal of
the American Medical Association, based on research
287
00:25:14.680 --> 00:25:18.839
which followed almost five hundred thousand people
over thirteen years. The study looked at
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00:25:18.839 --> 00:25:23.039
how much the participants sat at work, how much they exercised in their free
289
00:25:23.079 --> 00:25:27.000
time, as well as their health
outcomes and any deaths over the thirteen year
290
00:25:27.079 --> 00:25:33.039
period. The researchers say those who
sat all day at work but exercise for
291
00:25:33.119 --> 00:25:37.079
fifteen to thirty minutes a day outside
work had a similar risk of death to
292
00:25:37.119 --> 00:25:41.400
people who weren't sitting at work remained
inactive during their free time. The researchers
293
00:25:41.440 --> 00:25:45.759
say their study supports the evidence that
their jobs can be harmful to health.
294
00:25:47.440 --> 00:25:52.319
Reducing the amount of time you sit
at work and exercising more outside working hours
295
00:25:52.480 --> 00:25:59.799
can help reduce the risks. A
new Australian led study claims average global temperatures
296
00:26:00.000 --> 00:26:04.079
they already have risen by one point
five degrees celsius above pre industrial levels.
297
00:26:04.720 --> 00:26:10.599
Aiming to limit temperature rises to one
point five degrees celsius or below was the
298
00:26:10.640 --> 00:26:15.920
goal of the Paris Climate Agreement struck
in twenty fifteen. While previous estimates of
299
00:26:15.039 --> 00:26:19.720
warnings based on sea surface temperature records, these only date back to the mid
300
00:26:19.839 --> 00:26:25.680
nineteen hundreds, these new findings,
reported in the journal Nature Climate Change,
301
00:26:25.680 --> 00:26:30.039
are very different. They're based on
data from species of long lived sea sponges.
302
00:26:30.680 --> 00:26:36.880
These primitive animals contain hundreds of years
of data and chemical changes within their
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00:26:36.920 --> 00:26:41.440
skeletons, and this can be used
by scientists to estimate temperatures from March earlier.
304
00:26:42.079 --> 00:26:47.440
So the researchers used samples of these
sponges from species from the Eastern Caribbean
305
00:26:47.519 --> 00:26:52.079
in order to explore temperatures over the
last three hundred years, and they say
306
00:26:52.079 --> 00:26:56.000
their estimates show that one point five
degrees celsius of warming relative to pre industrial
307
00:26:56.119 --> 00:27:03.759
levels has already been reached. A
new study warns that outdoor artificial lighting at
308
00:27:03.880 --> 00:27:07.680
night could be linked to an increased
risk of macular degeneration, a leading cause
309
00:27:07.720 --> 00:27:14.039
of irreversible blindness. A report in
the Journal of the American Medical Association looked
310
00:27:14.039 --> 00:27:19.119
at some four thousand and seventy eight
patients newly diagnosed with age related macular degeneration,
311
00:27:19.519 --> 00:27:23.039
as well as one hundred and twenty
two three hundred and forty people without
312
00:27:23.039 --> 00:27:27.799
the disease, all over the age
of fifty. After estimating people's exposure to
313
00:27:27.920 --> 00:27:33.720
artificial outdoor light at night using satellite
data from around their addresses, the authors
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00:27:33.720 --> 00:27:37.240
found higher levels of outdoor artificial lighting
at night was linked to a higher risk
315
00:27:37.279 --> 00:27:44.880
of developing age related macular degeneration.
While this kind of research can't confirm whether
316
00:27:45.000 --> 00:27:48.279
lighting at night courses blindness, the
researcher say the findings do add to a
317
00:27:48.319 --> 00:27:53.200
body of research showing how much artificial
light at night could be impacting your health.
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00:27:55.920 --> 00:28:00.279
It's been revealed that the sleepy eastern
English county of Bedfordshire, often described
319
00:28:00.319 --> 00:28:06.880
as the country's most boring place is
actually a hotbed of pagan satanic activity.
320
00:28:07.559 --> 00:28:11.480
The title is England's most boring county
is based on the twenty eighteen Yugov poll
321
00:28:11.559 --> 00:28:15.640
of forty two thousand people. But
what's not so well known is that the
322
00:28:15.799 --> 00:28:22.359
same area is regarded as the nexus
of sorts. There are deconsecrated churches,
323
00:28:22.720 --> 00:28:27.839
strange ancient rock monuments, modible claims
of demonic visitations, and a long history
324
00:28:27.880 --> 00:28:33.160
of witch trials and Wickerman festivals.
Even today, it's claimed many villages in
325
00:28:33.200 --> 00:28:38.079
the area still have regular black masses
and at least two or three practicing witches.
326
00:28:38.880 --> 00:28:42.759
Thousand year old May festivals still take
place in the region, and one
327
00:28:42.839 --> 00:28:48.880
village even has a bizarre pancake day
witch listening. Tales of the devil stealing
328
00:28:48.000 --> 00:28:53.599
children and the souls of the wicket
abound. Timendum from Australian skeptics who actually
329
00:28:53.640 --> 00:28:56.799
lived in this county for some time, since the area was part of the
330
00:28:56.880 --> 00:29:02.559
Viking ruled Dane Law and as a
longer pagan history than Anglo Saxon Wessex,
331
00:29:02.720 --> 00:29:07.440
with Celts practicing the Druid religion once
common throughout the county. In fact,
332
00:29:07.480 --> 00:29:11.680
lived in Bedfordshire for about a year, yes, so, which proves what
333
00:29:11.720 --> 00:29:15.440
a hot beta is actually of everything. Bedford Shire is in the middle of
334
00:29:15.480 --> 00:29:18.680
England, sort of lower middle.
The biggest town is Luton, famous for
335
00:29:18.720 --> 00:29:22.400
the Luton Girls Choir, which doesn't
exist anymore. It's not the most exciting,
336
00:29:22.480 --> 00:29:25.200
I'm told, the most boring county
in England. Yeah, aparently there
337
00:29:25.240 --> 00:29:27.880
was a survey people, so I
don't know how many people in Bedfordshire decided
338
00:29:27.960 --> 00:29:30.880
that. But there's a lot of
hidden secrets in Bedfordshire. It is an
339
00:29:30.880 --> 00:29:33.599
old county and there's a lot of
old buildings in it. I think that
340
00:29:33.680 --> 00:29:36.960
was one of the ones I lived
in. Was pretty old and certainly elite.
341
00:29:37.000 --> 00:29:40.279
But what they have tanners? One
person described as sort of that.
342
00:29:40.359 --> 00:29:44.799
Bedfordshire is known for two things,
hack making and Satanism. Right, interesting
343
00:29:44.799 --> 00:29:48.960
combinations you'd normally put together, are
they? Well? I don't know what
344
00:29:48.000 --> 00:29:52.160
Satans wear on their head. Maybe
they have particular hats that you only get
345
00:29:52.160 --> 00:29:57.039
in bed Also the horns, wouldn't
you that's right. I'm sure every county
346
00:29:57.200 --> 00:30:00.680
in England, Scotland, Whale wherever, and a lot of other places as
347
00:30:00.720 --> 00:30:06.880
well have their fair share of ghosts
and haunted houses and halted castles and churches,
348
00:30:07.000 --> 00:30:11.480
run down churches, and strange occurrences. So what they stand out.
349
00:30:11.559 --> 00:30:14.480
There's a whole range of sort of
strange people who have lived there in the
350
00:30:14.519 --> 00:30:18.160
past, well more than other places, I don't know. There's characters who
351
00:30:18.200 --> 00:30:22.920
are involved in witchcraft and witch hunters
and witches and people who supposedly had evil
352
00:30:22.000 --> 00:30:26.039
powers over other people, and strange
occurrences, people coughing up needles and pins
353
00:30:26.079 --> 00:30:29.440
and all sorts of stuff. It
was actually home, I don't know if
354
00:30:29.440 --> 00:30:32.759
it's in Bedfordshire or in neighboring county, which was the hell Fire Club,
355
00:30:32.799 --> 00:30:36.720
which was the famous other sort of
gentle members of the late seventeen hundreds early
356
00:30:36.720 --> 00:30:41.240
eighteen hundreds who used to do all
sorts of stranger They used to do it
357
00:30:41.279 --> 00:30:45.079
for the hell of it, and
they were notorious for being the baut they're
358
00:30:45.079 --> 00:30:48.720
seen to be. There's a lot
of watch pitlets of time anyway in that
359
00:30:48.960 --> 00:30:52.200
ere pit, with more money than
there and plenty of time to do stuff.
360
00:30:52.240 --> 00:30:55.920
One of the interesting things is that
they actually refer to that one of
361
00:30:55.960 --> 00:30:57.640
the small towns that I lived in
there was a town called Layton Buzz.
362
00:30:57.680 --> 00:31:00.400
It's the one little name for Tanning
and the people think it actually comes from
363
00:31:00.480 --> 00:31:03.960
Latin voters are and that was quite
sure. But Layton Bosa sounds good,
364
00:31:03.960 --> 00:31:07.799
which has a church called Old Saints
Church which is in the middle of the
365
00:31:07.880 --> 00:31:12.559
market town actually and it's got ancient
graffiti of a basilisk cover and a demon
366
00:31:12.640 --> 00:31:17.599
cart into the stoneworks. Now there
was another church in the in vetrity which
367
00:31:17.599 --> 00:31:21.559
actually has the devil's footprints in the
front step. Trouble is they renovated the
368
00:31:21.640 --> 00:31:23.480
church and they were really fact I
thought there was strange That would have been
369
00:31:23.480 --> 00:31:27.200
a great tourist thing. But anyway, Bedfordshire, regarded by the survey as
370
00:31:27.200 --> 00:31:32.319
the most boring county in England,
does have its fair share of strange occurrences
371
00:31:32.319 --> 00:31:34.920
and things, and I think that
should be celebrated. That's Timendum from Austria
372
00:31:36.039 --> 00:31:56.319
in Skeptics and that's the show for
now. The Space Time is available every
373
00:31:56.319 --> 00:32:00.640
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Instagram, through our Spacetime YouTube channel,
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00:33:14.000 --> 00:33:17.279
and on Facebook. Just go to
Facebook dot com forward slash space Time with
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00:33:17.400 --> 00:33:22.359
Stuart Gary. You've been listening to
space Time with Steward Gary. This has
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00:33:22.400 --> 00:33:29.680
been another quality podcast production from bytes
dot com.
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This is Spacetime Series twenty seven,
episode sixteen, or broadcast on the fifth
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of February twenty twenty four. Coming
up on Space Time, the Earth's Moon
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00:00:10.560 --> 00:00:18.839
is shrinking and that means moonquakes for
astronauts. NASA's analysis confirms World Meteorological Organization
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figures showing that twenty twenty three was
the war misteir on record, and a
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new study indicates that stars travel more
slowly around the edge of the Milky Way.
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All that and more coming up on
space Time Welcome to Space Time with
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Stuart Gary. A new study has
confirmed earlier research showing that the Earth's Moon
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is shrinking and that it's causing landslides, instability, and moonquakes around the lunar
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South Pole. Scientists say the findings
will have consequences for the astronauts destined to
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explore and ultimately colonize this part of
the lunar's surface. The study, reported
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in the Planetary Science Journal As shown
that the Moon shrank more than forty six
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meters in circumference as it's called gradually
cooled over the last few hundred million years,
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in much the same way as a
grape will wrinkle as it shrinks down
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to become a raisin. The Moon
also develops creases as it shrinks, but
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unlike the flexible skin on a grape, the moon surface is brittle, causing
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falseter form where sections of crust pushed
past one another. Importantly, scientists of
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Nardis covered evidence that this shrinking of
the Moon's surface has led to notable surface
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warping near the lunar South Pole.
That's the region where NASA plans on landing
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its manned Artemis three mission in two
years time. In fact, because of
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the South Pole's easy access to water, although in a frozen state deep on
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the floors of permanently shaded craters,
the South Pole will become the likely main
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colonization point for future lunar missions to
the lunar surface. The problem is fault
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formation caused by the moon shrinkage is
often accompanied by searsmic activity like moonquakes,
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and locations within or in these such
fault zones could post dangers for future human
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exploration efforts. The authors have already
linked one group of forts located near the
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moon south Pole region to one of
the most powerful moonquakes ever recorded by the
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Apollo seismometers more than fifty years ago. Using models to simulate the stability of
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surface slopes within that region. Site
has found that some areas were especially vulnerable
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to landslides from seismic shaking. The
studies lead author Thomas Waters from the National
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Air and Space Museum set for Earthen
Planetary Studies, says the modeling suggests that
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shallow moonquakes capable of bridge using strong
ground checking in the South Pole region are
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possible from slip events on existing faults
or the formation of new thrust faults.
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He warns that the lunar global distribution
of young thrust faults, their potential to
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be active, and the potential to
form new thrust faults from ongoing global contraction
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should be considered when planning the location
and stability of permanent outposts on the Moon.
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The study suggest that shallow moonquakes occur
near the surface of the Moon,
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just one hundred of circular meters deep
into the crust. Similar to earthquakes,
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shallow moonquakes are caused by faults in
the lunar interior, and they can be
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strong enough to damage buildings, equipment, and other human made structures. But
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importantly, unlike earthquakes, which tend
to only last a few seconds or minutes,
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shallow moonquakes can last for hours,
even a whole afternoon. It means
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if we're not careful, shallow moonquakes
could devastate any future human settlements on the
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Moon. These new findings will help
prepare humans for it awaits them when they
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do move to the Moon, and
that needs to include engineering structures so they
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can better withstand Luna seismic activity,
thereby protecting people in the danger zones this
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space time still to come. A
new NASA analysis confirms the World Meteorological Organization's
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figures that show twenty twenty three was
the warmest Yuron record, and a new
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study shows that stars tend to travel
more slowly along the outer edge of the
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Milky Way Galaxy. All that and
more still to come on space time.
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A new NASA analysis has confirmed data
by the World Meteorological Organization that planetarth average
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surface temperature in twenty twenty three was
the stone record. Their data shows global
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temperatures last year were around one point
two degrees celsius above the average for NASA's
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baseline period, which is between nineteen
fifty one and nineteen eighty. NASA Administrator
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Bill Nilson says the studies by both
NASA and NOAH. The National Oceanographic and
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Atmospheric Administration clearly confirms that planet Earth
is facing a climate crisis. In twenty
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twenty three, hundreds of millions of
people around the world experienced extreme heat,
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and each month from June through to
December last year set a new global record
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for that respective month, and July
ended up being the hottest month ever recorded.
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Overall, planet Earth was about one
point four degrees celsius warmer in twenty
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twenty three than it was during the
late nineteenth century average that's when modern record
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keeping began. Meanwhile, the director
of NASA's god At Institute for Space Studies,
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Gavin Schmidt, says the exceptional warming
isn't something that we've seen before in
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human history. He says it is
being driven primarily by fossil fuel emissions,
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and we're seeing the impacts of this
in heat waves, intense rainfall, and
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coastal flooding. Those scientists have conclusive
evidence that the planet's long term warming trend
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is driven by human activity. They're
still examining other phenomena that could be affecting
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yearly or multi yearly changes in climate, such as el Nina aerosols and pollution,
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and volcanic eruptions. Now typically,
the largest source of yety of variability
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on Earth is the Al Nino Southern
Oscillation Index. It's a climate pattern based
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around the Pacific Ocean. The pattern
has two phases, El Nino and Lininia.
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During these phases, see surface temperatures
in the Pacific along the equator tend
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to switch between warmer average and cool
at temperatures. Now, what's been unusual
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of late is that between twenty twenty
and twenty twenty two, the Pacific Ocean
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saw three consecutive Linina events, which
tend to cool global temperatures. Then,
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in May twenty twenty three, the
ocean transition from La Nina to El Nino,
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which often coincides with the hottest Jees
on record. However, the record
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temperatures in the second half of twenty
twenty three occurred before the peg of the
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current El Nino event, and scientists
say they now expect to see the biggest
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impacts of El Nina over the next
three months. But it's not just El
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Nino. Scientists have also been investigating
the possible impacts of the January twenty twenty
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two eruption of the Hunger tonguahunga Ape
under sea volcano, which blasted water,
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vapor, and fine particles and aerosols
high into the stratosphere. A recent study
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found that the volcanic aerosols, by
reflecting sunlight away from the Earth's surface,
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actually led to an overall slight cooling
of the planet by about zero point one
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degree celsius that was mainly restricted to
the southern hemisphere. Immediately following the eruption,
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Nasaus symbols at surface temperature records using
air temperature data colling did from tens
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of thousands of meteorological stations. There's
also sea surface temperature data acquired either by
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ship or booy based instruments. All
this data is then analyzed using methods that
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account for varied spacing of temperature stations
around the globe and for things like the
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urban heat effect, they could be
skewing calculations. Independent analyzes by NOAH and
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by the Hadley Center, which is
part of the United Kingdom's Met Office,
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have also concluded that global surface temperatures
for twenty twenty three were the highest since
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modern record keeping began. Now,
while these scientists are all using the same
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temperature data in their analysis. They're
using different methodologies, yet they're arriving at
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the same conclusions. Although rankings can
be slightly different between the records, they're
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still all in broad agreement and they
clearly show that some ongoing, long term
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warming is taking place and has been
doing so over recent decades. This report
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from NASTV twenty twenty three was the
hottest year on record by a large margin.
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But why does NASA, a space
agency, even look at Earth's temperature
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record. Let's start from the beginning. NASA's Goddard Institute for Space Studies or
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GIS, creates the global temperature record
using land and ocean surface data collected from
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thousands of instruments and boobies around the
world. But this critical data set of
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Earth's temperature has an origin story that
starts one hundred million miles away on planet
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Venus. It's nine hundred degrees hot
of the surface, has powerful high altitude
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winds, and is blanketed by a
dense carbon dioxide. The GARDIS Suit for
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Space Study here in New York was
set up in the early nineteen sixties to
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provide a connection between NASA and the
academic community, and so it was very
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much an ideas shop, and so
we spent a lot of time with the
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formation of galaxies and black holes and
panetary program and Voyager, and we were
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involved very early on in some of
the missions to Venus and Jupiter. Back
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then, when GIFs researchers were studying
the weather on Venus, scientists noticed something
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fascinating. A thick atmosphere made up
of clouds and carbon dioxide was trapping heat,
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so much heat that Venus had a
surface hot enough to melt lead.
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This trapping of heat is known as
the greenhouse gas effect. One of the
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lead Venus researchers, I guess doctor
James Hansen, realized that greenhouse gases were
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also building up an Earth's atmosphere,
so he switched his sights to his home
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planet and pledged to model the changing
atmosphere of Earth and to verify our ground
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truth. As model, he needed
real world measurements over time, so he
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began keeping track of Earth's global temperature
record dating back to eighteen eighty When there
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was a sufficient amount of data to
pull from, we used our expertise in
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understanding literally the clouds of Venus and
the clouds and dynamics of Jupiter, and
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then we took that and we started
to think about how you would do the
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same thing for the Earth. Since
then, Guests has kept at sights on
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the global temperature record, and that
was the birth of Gifts as a climate
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modeling institution, and scientists have seen
a clear trend in that record rising temperatures,
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and they know why. The key
difference between say, this decade and
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the decade before and the decade before
that, is that the temperatures have been
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rising because of our activities, because
of principally the burning of fossil fuels.
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Without the presence of humans, Earth's
temperature would rise and fall due to a
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complex array of natural drivers. With
human presence, however, the temperature just
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continues to rise. We know that
by observing temperature anomalies. Measuring temperature anomalies
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means that we look at the change
over time rather than absolute temperatures. The
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data map isn't showing that the Arctic
style warmer temperatures than the tropics. It's
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saying the Arctic was that much warmer
than the Arctic has been in previous years,
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which is an anomaly in Arctic temperatures. But how do we get those
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anomaly measurements Let's say you want to
track if apples these days are generally larger,
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smaller, or the same size as
they were twenty years ago. In
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other words, you want to track
the change over time. Imagine each person
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on your apple measuring team has their
own food scale. Person A measures apple
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one and their food scale rates six
ounces. Person B measures the same apple,
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but their scale reads seven ounces.
Since these scales are calibrated differently,
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your team ended up with two different
recorded weights for the same exact apple.
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There's some imprecision in the measurements,
and to account for that when you compare
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this apple's measurement to the apples growing
next year, you'll need to look at
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their difference rather than absolute weights,
focusing on the anomaly, or how much
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heavier or lighter than next apple is
from year to year. So for temperatures,
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while it would be great to have
the same exact scale or thermometer all
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over the world measuring the temperature in
the same exact way, we don't.
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Instead we focus on how much warmer
or colder the temperatures are in each place,
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based on their own instruments. Another
factor to consider is, since you're
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tracking apples from all over the globe, there are differences in baseline weights.
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Let's say apples grown in Florida are
generally larger than apples grown in Alaska.
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Like in real life, how Floridian
temperatures are generally much higher than Alaskan temperatures.
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So how do you track the change
in apple size is from apples grown
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all over the world while still accounting
for their different baseline weights by focusing on
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the difference within each area rather than
the absolute weights. So when it comes
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to the temperature record, scientists aren't
comparing temperatures in Bermuda to temperatures in Greenland
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and averaging them together for net warming. Instead, they're comparing the change in
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temperatures in Bermuda to the change in
temperatures in Greenland. Again, we look
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at the anomaly measurements to track the
change over time. Now let's scale this
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example up. If you have a
weather station that's say here in New York
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City, and you compare it to
a weather station in Washington, d C.
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Or Montreal, they tell very different
stories about the absolute temperature. Right,
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So Montreal is colder and the Washington
d C Is often warmer. But
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when they move up and down,
when there's a month that is warmer or
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colder, it's basically the same in
all three locations. And so by looking
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at the anomalies how much warmer it
is than normal for that particular point,
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and then you look at those anomalies
at all those different points and you can
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average those. It turns out that
you can fill out the gaps much more
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effectively. This big picture global temperature
is comprised of much smaller concentrated data points
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from all over the world. So
while globally temperatures average out to be record
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hot, it wasn't record hot in
every single location around the world. But
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why did twenty twenty three see record
heat? Well, to put it simply,
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a combination of high greenhouse gas emissions
and the transition out of three consecutive
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years of Lannina conditions and into al
Nino conditions led to record breaking heat,
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But the year was in some respects
still surprisingly hot, and NASA is continuing
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its research on why. Typically the
largest cause of short term year to year
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differences in temperature is usually La Nina
and al Nina weather patterns. Laninia generally
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cools things down while warms them up. The largest cause of long term decade
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by decade differences in temperature is greenhouse
gas emissions and the subsequent trapped heat by
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greenhouse gases. So while we don't
expect every year to be a new record
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like twenty twenty three, we do
expect new records as long as we continue
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to increase greenhouse gas emissions. The
key thing to take away from all of
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this is that the long term trends
are pretty much relentlessly up. We're going
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to continue to have records be broken
because that baseline is moving all the time,
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and then the weather is sitting on
top of that, and so when
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the weather is warmer than normal,
then we're going to get these records.
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But even when it's cooled in the
normal, we don't go back to what
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it was. And in that report
from That's a TV, we heard from
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Gavin Schmidt, the director of NASA's
got Out Institute for Space Studies, this
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00:17:03.400 --> 00:17:10.640
space Time Still to Come a you
study show stars travel more slowly around the
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edge of the Milky Way galaxy,
and later in the science report, your
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research shows that people who sit for
long periods of time at work have a
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sixty percent higher risk of death.
All that are more still to come on
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space time By clocking the speed of
stars throughout the Milky Way Galaxy, physicists
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have discovered that stars further out on
the galactic disc are traveling more slowly than
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expected compaired to stars that are closer
to the galaxy center. The findings,
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reported in the Monthly Notices of the
Royal Astronomical Society's Journal, erasing the possible
199
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ability that the Milky Wate gravitational core
may be lighter in mass and contain less
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dark matter than previously thought. The
new results are based on an analysis of
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data taken by both the GYA and
APERGE instruments. GIA is an orbiting space
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telescope run by the European Space Agency. It's tracking the precise location, distance
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and motion of more than a billion
stars throughout the Milky Way Galaxy. Meanwhile,
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APERGY is a ground based survey telescope. The physicist analyzed GUIAS measurements of
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more than thirty three thousand stars,
including some of the furthest stars in the
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galaxy, and they determined eight stars
circular velocity. Now, circular velocity is
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how fast the star is circling the
galactic disc given the stars distance from the
208
00:18:45.359 --> 00:18:52.160
galactic center. The authors then plotted
each star's velocity against its distance to generate
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a rotational curve. It's a standard
graphic astronomy representing how fast matters rotating at
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at given distance from the center of
a galaxy. The shape of this curve
211
00:19:02.400 --> 00:19:06.759
and gives scientists an idea of how
much visible and dark matter is distributed throughout
212
00:19:06.799 --> 00:19:10.519
the galaxy. One of the studies
authors, Lena A. KiB from the
213
00:19:10.559 --> 00:19:15.319
Massachusetts Institute of Technology MIT, says
what really surprised the authors was that this
214
00:19:15.559 --> 00:19:19.880
curve remained flat, and it continued
to stay flat all the way out to
215
00:19:19.920 --> 00:19:26.279
a certain distance, and then it
suddenly started tanking away. This means the
216
00:19:26.319 --> 00:19:30.599
outer stars of the galaxy are rotating
a little slower than expected, which is
217
00:19:30.640 --> 00:19:34.799
a very surprising result. The authors
then translated this new rotational curve to a
218
00:19:34.839 --> 00:19:41.279
distribution of dark matter that could explain
the outer stars slow down. They found
219
00:19:41.279 --> 00:19:45.880
the resulting map ended up producing a
lighter galactic core than what was expected.
220
00:19:45.599 --> 00:19:49.480
In other words, the center of
the Milky Way galaxy might be less dense
221
00:19:49.599 --> 00:19:55.200
with less dark matter than what astronomers
had always thought. The new results,
222
00:19:55.240 --> 00:20:00.079
therefore, are in clear tension with
other measurements. The authors say there's something
223
00:20:00.119 --> 00:20:03.880
fishy going on somewhere. Like most
galaxies in the universe, our milky Way
224
00:20:04.000 --> 00:20:07.880
spins, I guess sort of like
water at a whirlpool, and its rotation
225
00:20:08.039 --> 00:20:12.400
is driven in part by all the
matter that's swirling within the disk. It
226
00:20:12.519 --> 00:20:18.759
was back in the nineteen seventies when
astronomer Verra Ruben became the first to observe
227
00:20:18.960 --> 00:20:22.279
that galaxies rotate in a way that
cannot be purely driven by their visible matter.
228
00:20:23.000 --> 00:20:27.240
Ruben and colleagues measured the circular velocity
of stars and found that the resulting
229
00:20:27.359 --> 00:20:33.079
rotational curves were surprisingly flat. That
is, the velocity of the stars going
230
00:20:33.079 --> 00:20:37.200
around the center remained the same throughout
the galaxy, whether or not they were
231
00:20:37.200 --> 00:20:41.240
close to the center or out near
the edge. Their rotational curves weren't dropping
232
00:20:41.279 --> 00:20:47.720
off with distance. Rubon and colleagues
concluded that some other type of invisible matter,
233
00:20:47.920 --> 00:20:51.960
stuff we now call dark matter,
must be acting on distant stars to
234
00:20:52.000 --> 00:20:56.359
give them an additional push. In
this regard, Ruben's work in rotation curves
235
00:20:56.519 --> 00:21:00.799
was one of the first strong pieces
of evidence for them in the existence of
236
00:21:00.880 --> 00:21:04.880
dark matter, an invisible, unknown
entity which we know exists and must make
237
00:21:04.960 --> 00:21:10.559
up more than three quarters of all
the matter in the universe. Since then,
238
00:21:10.680 --> 00:21:15.599
astronomers have observed similar flat curves in
other far off galaxies, further supporting
239
00:21:15.680 --> 00:21:19.839
dark matters presence. But only recently
of astronomers attempted to chart the rotation curve
240
00:21:19.839 --> 00:21:25.160
in our own galaxy with stars,
and it turns out it's a lot harder
241
00:21:25.200 --> 00:21:29.680
to measure the rotational curve when you're
actually sitting deep inside the galaxy. Back
242
00:21:29.720 --> 00:21:33.920
in twenty nineteen, Anachristina Elliots from
MIT worked to chart the Milky Way's rotation
243
00:21:34.079 --> 00:21:38.640
curve using an earlier batch of data
release by Geyer. Now that data release
244
00:21:38.680 --> 00:21:42.920
included stars as farret as twenty five
Killer Parssex, which is about eighty one
245
00:21:44.039 --> 00:21:48.440
thousand light years from the galaxy center. Now, based on these data,
246
00:21:48.559 --> 00:21:52.759
Elliots observed that the Milky Way's rotation
curve appeared to be flat, although with
247
00:21:52.839 --> 00:21:56.279
a mild decline, similar to other
far off galaxies, and by inference,
248
00:21:56.799 --> 00:22:00.759
our galaxy likely bore a high day
density of dark matter at its core.
249
00:22:02.480 --> 00:22:06.079
But this view is now shifted as
guys released a new batch of data,
250
00:22:06.160 --> 00:22:10.160
this time including stars as far at
as thirty kilo Parssex. That's almost one
251
00:22:10.200 --> 00:22:15.480
hundred thousand light years from the galaxy's
core. Now these distances, astronomers are
252
00:22:15.480 --> 00:22:18.119
looking right at the edge of our
galaxy, the place where stars are starting
253
00:22:18.119 --> 00:22:22.559
to peter out. No one's ever
explored how much matter moves around in this
254
00:22:22.680 --> 00:22:29.319
outer galaxy region. It's where we're
really starting to touch the nothingness of intergalactic
255
00:22:29.400 --> 00:22:33.519
space. So as you can imagine, the studies authors jumped on Guys' latest
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00:22:33.559 --> 00:22:37.480
data at least late last year,
looking to expand on at least initial rotation
257
00:22:37.680 --> 00:22:41.720
curve. To refine their analysis.
They complemented the gay A telescope data with
258
00:22:41.839 --> 00:22:48.119
measurements by APERGEY, the Apergey Point
Observatory Galactic Evolution Experiment. It's measuring extremely
259
00:22:48.200 --> 00:22:52.240
detailed properties of more than seven hundred
thousand stars in the Milky Way, such
260
00:22:52.240 --> 00:22:57.000
as their brightness, their temperature,
and their elemental composition. The data is
261
00:22:57.039 --> 00:23:02.880
then fit into an algorithm try and
learn connections that can give scientists a better
262
00:23:03.000 --> 00:23:07.720
estimate of a star's distance. The
authors use this data to establish a precise
263
00:23:07.799 --> 00:23:11.119
distance system more than thirty three thousand
stars, and use these measurements to generate
264
00:23:11.160 --> 00:23:15.279
a three dimensional map of the stars
scattered across the Milky Way out to around
265
00:23:15.359 --> 00:23:21.680
thirty kilo Parssex. They then incorporated
this vast map into a model of circular
266
00:23:21.759 --> 00:23:26.119
velocity in order to simulate how fast
any one star must be traveling given the
267
00:23:26.160 --> 00:23:30.440
distribution of all the other stars in
the galaxy. They then plotted each star's
268
00:23:30.519 --> 00:23:34.079
velocity and distance on a chart in
order to produce an updated rotation curve of
269
00:23:34.119 --> 00:23:40.480
the whole Milky Way itself, and
that is where the weirdnesses come in.
270
00:23:40.480 --> 00:23:44.960
Instead of seeing a mild decline like
previous rotation curves, the authors observed that
271
00:23:45.039 --> 00:23:48.759
this new curve get far more strongly
than expected at the utter end. Now,
272
00:23:48.759 --> 00:23:53.319
this unexpected downturn suggest that while stars
may be traveling just as fast out
273
00:23:53.359 --> 00:23:59.319
to a certain distance, they then
suddenly slow down beyond this distance. When
274
00:23:59.319 --> 00:24:03.440
the team transition this rotation curve to
the amount of dark matter that must exist
275
00:24:03.440 --> 00:24:07.920
throughout the galaxy, they found that
the Milky Waiste core must contain far less
276
00:24:07.000 --> 00:24:11.920
dark matter than what they had previously
estimated. The result is clearly intension,
277
00:24:12.000 --> 00:24:18.920
with other measurements. Really understanding the
meaning of this result will undoubtedly have debrief
278
00:24:18.920 --> 00:24:22.440
percussions. This could simply be leading
to more hidden masses just beyond the edge
279
00:24:22.480 --> 00:24:26.599
of the galactic disk, or could
mean a total reconsideration of the state of
280
00:24:26.680 --> 00:24:32.200
the equilibrium of our galaxy. You
can be sure of one thing, whatever
281
00:24:32.319 --> 00:24:52.240
unfolds will be fascinating. This is
space time. Time out to take a
282
00:24:52.240 --> 00:24:56.440
brief look at some of the other
stories making use in science this week with
283
00:24:56.519 --> 00:25:00.079
a science report. A new study
has shown that people who sit for prolonged
284
00:25:00.079 --> 00:25:04.359
periods of time at work wind up
having a sixteen percent higher risk of death
285
00:25:04.359 --> 00:25:08.960
from any cause and a thirty four
percent higher risk of heart disease. The
286
00:25:10.039 --> 00:25:14.640
findings were reported in the Journal of
the American Medical Association, based on research
287
00:25:14.680 --> 00:25:18.839
which followed almost five hundred thousand people
over thirteen years. The study looked at
288
00:25:18.839 --> 00:25:23.039
how much the participants sat at work, how much they exercised in their free
289
00:25:23.079 --> 00:25:27.000
time, as well as their health
outcomes and any deaths over the thirteen year
290
00:25:27.079 --> 00:25:33.039
period. The researchers say those who
sat all day at work but exercise for
291
00:25:33.119 --> 00:25:37.079
fifteen to thirty minutes a day outside
work had a similar risk of death to
292
00:25:37.119 --> 00:25:41.400
people who weren't sitting at work remained
inactive during their free time. The researchers
293
00:25:41.440 --> 00:25:45.759
say their study supports the evidence that
their jobs can be harmful to health.
294
00:25:47.440 --> 00:25:52.319
Reducing the amount of time you sit
at work and exercising more outside working hours
295
00:25:52.480 --> 00:25:59.799
can help reduce the risks. A
new Australian led study claims average global temperatures
296
00:26:00.000 --> 00:26:04.079
they already have risen by one point
five degrees celsius above pre industrial levels.
297
00:26:04.720 --> 00:26:10.599
Aiming to limit temperature rises to one
point five degrees celsius or below was the
298
00:26:10.640 --> 00:26:15.920
goal of the Paris Climate Agreement struck
in twenty fifteen. While previous estimates of
299
00:26:15.039 --> 00:26:19.720
warnings based on sea surface temperature records, these only date back to the mid
300
00:26:19.839 --> 00:26:25.680
nineteen hundreds, these new findings,
reported in the journal Nature Climate Change,
301
00:26:25.680 --> 00:26:30.039
are very different. They're based on
data from species of long lived sea sponges.
302
00:26:30.680 --> 00:26:36.880
These primitive animals contain hundreds of years
of data and chemical changes within their
303
00:26:36.920 --> 00:26:41.440
skeletons, and this can be used
by scientists to estimate temperatures from March earlier.
304
00:26:42.079 --> 00:26:47.440
So the researchers used samples of these
sponges from species from the Eastern Caribbean
305
00:26:47.519 --> 00:26:52.079
in order to explore temperatures over the
last three hundred years, and they say
306
00:26:52.079 --> 00:26:56.000
their estimates show that one point five
degrees celsius of warming relative to pre industrial
307
00:26:56.119 --> 00:27:03.759
levels has already been reached. A
new study warns that outdoor artificial lighting at
308
00:27:03.880 --> 00:27:07.680
night could be linked to an increased
risk of macular degeneration, a leading cause
309
00:27:07.720 --> 00:27:14.039
of irreversible blindness. A report in
the Journal of the American Medical Association looked
310
00:27:14.039 --> 00:27:19.119
at some four thousand and seventy eight
patients newly diagnosed with age related macular degeneration,
311
00:27:19.519 --> 00:27:23.039
as well as one hundred and twenty
two three hundred and forty people without
312
00:27:23.039 --> 00:27:27.799
the disease, all over the age
of fifty. After estimating people's exposure to
313
00:27:27.920 --> 00:27:33.720
artificial outdoor light at night using satellite
data from around their addresses, the authors
314
00:27:33.720 --> 00:27:37.240
found higher levels of outdoor artificial lighting
at night was linked to a higher risk
315
00:27:37.279 --> 00:27:44.880
of developing age related macular degeneration.
While this kind of research can't confirm whether
316
00:27:45.000 --> 00:27:48.279
lighting at night courses blindness, the
researcher say the findings do add to a
317
00:27:48.319 --> 00:27:53.200
body of research showing how much artificial
light at night could be impacting your health.
318
00:27:55.920 --> 00:28:00.279
It's been revealed that the sleepy eastern
English county of Bedfordshire, often described
319
00:28:00.319 --> 00:28:06.880
as the country's most boring place is
actually a hotbed of pagan satanic activity.
320
00:28:07.559 --> 00:28:11.480
The title is England's most boring county
is based on the twenty eighteen Yugov poll
321
00:28:11.559 --> 00:28:15.640
of forty two thousand people. But
what's not so well known is that the
322
00:28:15.799 --> 00:28:22.359
same area is regarded as the nexus
of sorts. There are deconsecrated churches,
323
00:28:22.720 --> 00:28:27.839
strange ancient rock monuments, modible claims
of demonic visitations, and a long history
324
00:28:27.880 --> 00:28:33.160
of witch trials and Wickerman festivals.
Even today, it's claimed many villages in
325
00:28:33.200 --> 00:28:38.079
the area still have regular black masses
and at least two or three practicing witches.
326
00:28:38.880 --> 00:28:42.759
Thousand year old May festivals still take
place in the region, and one
327
00:28:42.839 --> 00:28:48.880
village even has a bizarre pancake day
witch listening. Tales of the devil stealing
328
00:28:48.000 --> 00:28:53.599
children and the souls of the wicket
abound. Timendum from Australian skeptics who actually
329
00:28:53.640 --> 00:28:56.799
lived in this county for some time, since the area was part of the
330
00:28:56.880 --> 00:29:02.559
Viking ruled Dane Law and as a
longer pagan history than Anglo Saxon Wessex,
331
00:29:02.720 --> 00:29:07.440
with Celts practicing the Druid religion once
common throughout the county. In fact,
332
00:29:07.480 --> 00:29:11.680
lived in Bedfordshire for about a year, yes, so, which proves what
333
00:29:11.720 --> 00:29:15.440
a hot beta is actually of everything. Bedford Shire is in the middle of
334
00:29:15.480 --> 00:29:18.680
England, sort of lower middle.
The biggest town is Luton, famous for
335
00:29:18.720 --> 00:29:22.400
the Luton Girls Choir, which doesn't
exist anymore. It's not the most exciting,
336
00:29:22.480 --> 00:29:25.200
I'm told, the most boring county
in England. Yeah, aparently there
337
00:29:25.240 --> 00:29:27.880
was a survey people, so I
don't know how many people in Bedfordshire decided
338
00:29:27.960 --> 00:29:30.880
that. But there's a lot of
hidden secrets in Bedfordshire. It is an
339
00:29:30.880 --> 00:29:33.599
old county and there's a lot of
old buildings in it. I think that
340
00:29:33.680 --> 00:29:36.960
was one of the ones I lived
in. Was pretty old and certainly elite.
341
00:29:37.000 --> 00:29:40.279
But what they have tanners? One
person described as sort of that.
342
00:29:40.359 --> 00:29:44.799
Bedfordshire is known for two things,
hack making and Satanism. Right, interesting
343
00:29:44.799 --> 00:29:48.960
combinations you'd normally put together, are
they? Well? I don't know what
344
00:29:48.000 --> 00:29:52.160
Satans wear on their head. Maybe
they have particular hats that you only get
345
00:29:52.160 --> 00:29:57.039
in bed Also the horns, wouldn't
you that's right. I'm sure every county
346
00:29:57.200 --> 00:30:00.680
in England, Scotland, Whale wherever, and a lot of other places as
347
00:30:00.720 --> 00:30:06.880
well have their fair share of ghosts
and haunted houses and halted castles and churches,
348
00:30:07.000 --> 00:30:11.480
run down churches, and strange occurrences. So what they stand out.
349
00:30:11.559 --> 00:30:14.480
There's a whole range of sort of
strange people who have lived there in the
350
00:30:14.519 --> 00:30:18.160
past, well more than other places, I don't know. There's characters who
351
00:30:18.200 --> 00:30:22.920
are involved in witchcraft and witch hunters
and witches and people who supposedly had evil
352
00:30:22.000 --> 00:30:26.039
powers over other people, and strange
occurrences, people coughing up needles and pins
353
00:30:26.079 --> 00:30:29.440
and all sorts of stuff. It
was actually home, I don't know if
354
00:30:29.440 --> 00:30:32.759
it's in Bedfordshire or in neighboring county, which was the hell Fire Club,
355
00:30:32.799 --> 00:30:36.720
which was the famous other sort of
gentle members of the late seventeen hundreds early
356
00:30:36.720 --> 00:30:41.240
eighteen hundreds who used to do all
sorts of stranger They used to do it
357
00:30:41.279 --> 00:30:45.079
for the hell of it, and
they were notorious for being the baut they're
358
00:30:45.079 --> 00:30:48.720
seen to be. There's a lot
of watch pitlets of time anyway in that
359
00:30:48.960 --> 00:30:52.200
ere pit, with more money than
there and plenty of time to do stuff.
360
00:30:52.240 --> 00:30:55.920
One of the interesting things is that
they actually refer to that one of
361
00:30:55.960 --> 00:30:57.640
the small towns that I lived in
there was a town called Layton Buzz.
362
00:30:57.680 --> 00:31:00.400
It's the one little name for Tanning
and the people think it actually comes from
363
00:31:00.480 --> 00:31:03.960
Latin voters are and that was quite
sure. But Layton Bosa sounds good,
364
00:31:03.960 --> 00:31:07.799
which has a church called Old Saints
Church which is in the middle of the
365
00:31:07.880 --> 00:31:12.559
market town actually and it's got ancient
graffiti of a basilisk cover and a demon
366
00:31:12.640 --> 00:31:17.599
cart into the stoneworks. Now there
was another church in the in vetrity which
367
00:31:17.599 --> 00:31:21.559
actually has the devil's footprints in the
front step. Trouble is they renovated the
368
00:31:21.640 --> 00:31:23.480
church and they were really fact I
thought there was strange That would have been
369
00:31:23.480 --> 00:31:27.200
a great tourist thing. But anyway, Bedfordshire, regarded by the survey as
370
00:31:27.200 --> 00:31:32.319
the most boring county in England,
does have its fair share of strange occurrences
371
00:31:32.319 --> 00:31:34.920
and things, and I think that
should be celebrated. That's Timendum from Austria
372
00:31:36.039 --> 00:31:56.319
in Skeptics and that's the show for
now. The Space Time is available every
373
00:31:56.319 --> 00:32:00.640
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