Dec. 8, 2025
Galactic Tug-of-War: The Small Magellanic Cloud's Struggle Against Gravitational Forces
In this episode of SpaceTime, we delve into fascinating cosmic phenomena and groundbreaking discoveries that could reshape our understanding of the universe. The Small Magellanic Cloud: A Galaxy Under Duress Astronomers have uncovered that the Small...
(00:00:00) Galactic Tug-of-War: The Small Magellanic Cloud's Struggle Against Gravitational Forces
(00:00:46) One of our nearest neighbouring galaxies being torn apart
(00:08:00) A giant spider on the Jovian Ice Moon Europa
(00:12:23) Mars could have been habitable for long periods
(00:14:14) The Science Report
(00:17:23) Skeptics guide to why some people are born suckers
(00:20:24) Episode Wrap
In this episode of SpaceTime, we delve into fascinating cosmic phenomena and groundbreaking discoveries that could reshape our understanding of the universe.
The Small Magellanic Cloud: A Galaxy Under Duress
Astronomers have uncovered that the Small Magellanic Cloud, a nearby dwarf galaxy, is being torn apart by gravitational forces from its neighbor, the Large Magellanic Cloud. This revelation, published in the Astrophysical Journal Letters, highlights the complex movements of Cepheid variable stars within the galaxy, indicating that it is being stretched in multiple directions. By utilizing data from the European Space Agency's Gaia satellite, researchers have gained unprecedented insights into the interactions between these two galaxies, prompting a reevaluation of their structural dynamics and gravitational relationships with the Milky Way.
Europa's Spider: Signs of Subsurface Water?
A striking spider-like feature on Jupiter's moon Europa has scientists buzzing with excitement. Researchers suggest this formation, found near the Menanan impact crater, may be evidence of subsurface water seeping through the moon's icy crust following an asteroid impact. The findings, reported in the Planetary Science Journal, could have significant implications for the moon's habitability and the presence of life. By drawing parallels with similar features on Mars, scientists are eager to explore Europa's subsurface properties further, especially with the upcoming Europa Clipper mission set to launch in April 2030.
Mars: A Longer Habitable History?
New research indicates that Mars may have been habitable for a much longer duration than previously believed. A study published in the Journal of Geophysical Research Planets reveals that ancient underground water may have flowed beneath the Martian sand dunes, creating conditions conducive to life long after its surface water disappeared. This discovery not only enhances our understanding of Mars' geological history but also highlights the potential of subsurface environments as targets for future exploration in the search for past life.
www.spacetimewithstuartgary.com
✍️ Episode References
Astrophysical Journal Letters
Planetary Science Journal
Journal of Geophysical Research Planets
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The Astronomy, Space, Technology & Science News Podcast.
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This is Spacetime Series twenty eight, episode one hundred and
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forty four, for broadcast on the eighth of December twenty
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twenty five. Coming up on Space Time, one of our
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nearest neighboring galaxies being torn apart, a giant spider on
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the Jovian icemoon Europa, and a new study suggests the
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red planet Mars may have been habitable for far longer
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than previously thought. All that and more coming up on
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space Time.
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Welcome to space Time with Stuart Garry.
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Astronomers have discovered that the Small Magellanic Cloud is being
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pulled apart by massive gravitational forces. The findings, reported in
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the Astrophysical Journal Letters, are based on observations of stars
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and known as Cefiid variables located in the Small Magellanic Cloud,
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which are moving in opposite directions along two very distinct axes.
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Cefiad variables are pulsetting stars that expanding contract that set
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intervals based on their luminosity, and astronomers can determine their
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intrinsic brightness based on these pulsations. So by knowing how
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bright they appear compared to how bright they really are,
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astronomers can determine how far away they must be using
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the inverse square law. Located some two hundred thousand light
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years away, the Small Magellanic Cloud is a nearby satellite
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dwarf galaxy orbiting the Milky Way, visible in the southern
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hemisphere night skies. Studies authors found that sepiad variables in
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the Small Magellanic Cloud closer to Worth are moving towards
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the northeast, or more distant cefiad variables are moving in
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a southwesterly direction. These complex bi directional movements along two
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different axes indicates that the Small Magellanic Cloud is being
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stretched by multiple external gravitational forces. Its neighbor, the Large
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Magellanic Cloud, another dwarf galaxy orbiting the Milky Way, is
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pulling it in one direction, and some other, as yet
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unknown force is pulling it the other way. This study
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is the first to analyze stellar motions within the Small
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Magellanic Cloud, taking individual stellar distances into account. Previous studies
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that have investigated stellar motions within the Small Magellanic Cloud
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assumed that all the stars were roughly at the same
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distance from Earth, an oversimplification due to the lack of
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precise distant measurements and that must have caused errors. So
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to rectify that situation, the authors of this new study
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use data from the European Space Agency's GAIA satellite to
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analyze more than four thy two hundred Cepheid variable stars.
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By accounting for these individual distances, the authors were then
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able to analyze the star's movements with far more accuracy
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than any previous measurements. An earlier study by the same
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group of astronomers had already determined that the small Machelanic
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cloud was being stretched by its bigger neighbor, a large
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Magellanic cloud. These two galaxies are gravitationally bound and they
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interact with each other, and these interactions are likely to
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have influenced their structure and evolution. One of the studies authors,
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Kenjo Tachiara, from the Goya University, says there's also a
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possibility that the gravitational influence of our own galaxy, the
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Milky Way, or possible effects from past closing carters between
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the two Magelanic clouds is contributing to the torsion being seen.
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This new study also confirmed the idea that the small
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Magellanic cloud does not rotate, further suggesting that this relatively small,
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regular shaped galaxy has unique dynamics influenced by gravitational interactions
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with the Milky Way and with a large Magellanic cloud.
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These new discoveries challenge previous theories of the galaxy structure
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in dynamics. It means astronomers need to rethink how the
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small Machelanic cloud, a large Magellanic cloud, and our own
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Milky Way galaxy interact with each other. That means that
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new computer simulations that consider the small Magellanic clouds non
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rotating nature will be needed in order to help understand
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these complex relationships. Meanwhile, astronomer Remi Indy Bitau from the
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University of Virginia, who was not involved in this study,
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since the two Magellanic clouds have been interacting with each
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other for millions of years, but this is their first
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encounter with the Milky Way.
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The Madelinic clouds, which consist of a pair of galaxies,
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a more massive one and a less massive one that
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we creatively call the large Magellanic Cloud and the small
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Magellanic Cloud, are the closest extragalactic system interacting in some
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way with the Milky Way, and they have somewhat lower
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abundances of heavy metals than the Milky Way. They are
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the nearest sizable neighbor galaxies to the Milky Way. And
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what I mean by sizable is there are some very
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small ones, but the Magellanic cloud are the closest ones
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which are making stars and have some substructure and are
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participating in processes that normal galaxies, normal sized galaxies would
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participate in. We believe, based on fairly recent work, that
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the large and small Magellanic cloud are falling in from
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intergalactic space, so falling towards the Milky Way for the
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first time. There's a large stream of atomic hydrogen which
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appears to be trailing behind them across a large part
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of the sky, and so their orbits were measured with
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more precise astrometry. You can run the orbit backwards in
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time and see that it goes out in an intergalactic space,
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and we can actually trace the star formation history of
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the Magellanic clouds and look at times in their history
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as one such time was a few hundred million years
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ago where the rate of forming new stars was much
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higher than it is now, or there was a peak
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in that rate of forming new stars, and that matches
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with an interaction a close passage of the small and
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large cloud. So we can go back in time and
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track how they interacted with each other. But we don't
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think they've interacted repeatedly with us. They've been together longer
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than they've been with us. Most of the universe is
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hydrogen and helium, but hydrogen and helium are not all
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that good at cooling at radiating energy, and so if
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gas galaxies gets warm, it's actually the trace heavy elements.
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They're few in number, but they dominate the reradiation of
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that energy and the cooling of the galaxy or the
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cooling of parts of the galaxy at least, and condensing
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and making stars, for example, and evolving. So we expect
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that when there's quite a bit less of those heavy elements,
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then that will affect the structure of molecular clouds, how
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they collapse, how they cool how they make stars. So
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we want to study all these things in environment. This
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is the nearest such environment that's a bit different, has
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a different range of physical conditions from the Milky Way.
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That's remy Indye Batau from the University of Virginia and
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the National Radio Astronomy Observatory, and this space time still
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to come, A giant spider on the Jovian Ice moon Europa,
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and could the red planet Mars have been habitable for
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long periods of time? All that and more still to
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come on space time. A new study claims a unique
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spider like feature on the Jervian Ice moon Europa, maybe
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subsurface water seeping through the frozen crust following an asteroid impact.
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The findings, reported in the Planetary Science Journal, might point
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astronomers to the Moon's potential for life. The spider shaped
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feature is located on Europe's men and an impact crater.
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The studies authors believe it may have been formed through
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the eruption of melted brines from a subsurface pool in
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the Moon's icy crust following the impact. Europa is covered
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in a thick shell of ice many kilometis thick below
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this is a global subsurface liquid water ocean, and astronomers
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believe the icy crust itself contains cavities filled with pills
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and reservoirs of melted brine. The studi's lead author, Laura
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McEwen from the University of Central Florida, says, if correct,
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it could inform scientists about the frozen Moon's subsurface properties
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and its sprying composition at the time of the impact.
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The Qwan and colleagues have also studied Martian spiders, which
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are branching treelike features that form in the regulars near
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the Martian South Pole. They applied that knowledge to other
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planetary surfaces, including Europa. While the Martian spiders form when
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dust and sand are eroded by escaping gas from below
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seasonally dry ice layers, the team's Europa work asserts that
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the asterisk shaped feature more likely formed from an impact.
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McEwan says features known as the lake stars here on
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Earth are radial branching patterns that form when snow falls
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on frozen lakes and the weight of the snow creates
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holes in the ice, and that allows water to flow
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through the snow, melting it and spreading it out in
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a spider like pattern. She says on Europa, a subsurface
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brine reservoir could have erupted after an impact and spread
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through porous surface ice, producing a similar pattern. The authors
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have informally named the spider feature on Europa damn Hanah,
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which is Irish for spider, in order to distinguish it
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from the Martian spider. Formations. Using numerical modeling of the
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brine reservoir, the authors obtained constraints on the reservoir's potential depth,
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which is thought to be about six kilometers below the surface,
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and its age, which is likely to be several thousand
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years old. To test the hypotheses, the authors also conducted
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filled and lab experiments. They observed starlaggs in Colorado and
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recreated the same process in a cryogenic lab at NASA's
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Jet Propulsion Laboratory passed into California using Europa ice simulants
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cooled with liquid nitrogen. But Quan and colleagues then flowed
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water through these simulants under different temperatures, finding that similar
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star like patterns formed even under extremely cold temperatures of
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minus one hundred degrees celsius, and that supports the idea
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that the same mechanisms could occur in Europa following an
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impact event. Observations of the spider like feature on Europa
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have been limited to images provided by the Galilea spacecraft
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back in nineteen ninety eight, but the authors now hope
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to resolve this question with higher resolution imagery from NASA's
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Europa clipp emission, which will arrive at the Jovian System
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in April twenty thirty. The Quan says, while lake stars
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here on Earth have provided valuable insights, simple fact is
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Earth's conditions are very different to those of Europa. Earth
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has a nitrogen rich atmosphere, while Europa's environment is extremely
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low in pressure and temperature. The Qan now wants to
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investigate how different pressure affects the formation of these features
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and whether they could form beneath an icy crust, similar
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to how lava flows on Earth to create smooth ropey textures.
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She says the new findings offer important clues about the
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subsurface activity and habitability of Europa, and these clues will
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be crucial for future astrobiological research. This is space time
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still to come. A new study suggests the red planet
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Mars may have been habitable for much longer than currently believed,
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and later the science report we look at the origins
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of the domestic housecat. All that and more still to
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come on space time. A new study suggests the red
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planet Mars may have been habitable far longer than previously thought.
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Are reporting the Journal of Geophysical Research Planets says evidence
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of ancient underground water reveals the life giving liquid once
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flowed beneath the Martian sand dunes, creating conditions that could
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have supported life for far longer than previously considered. The
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study shows that ancient sand dunes in gau Crater, a
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region explored by NASA's Mars Curiosity rover, gradually turned into
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rock after interacting with groundwater billions of years ago. The
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authors compared data from Curiosity with rough formation in the
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United Arab Emirates desert that formed under similar conditions here
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on Earth. They found that water from a nearby Martian
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mountain once seeped into these dunes through tiny cracks, soaking
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the sand from below and leaving behind minerals such as gypsum,
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the same material found in Earth's deserts. These minerals can
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trap and preserve traces of organic material, making them valuable
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targets for future man missions seeking evidence of past life.
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The authors say the new findings show that Mars didn't
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simply go from wet to dry. It suggests that even
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after its lakes and rivers disappeared, small amounts of water
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continued to move underground in the process, creating protected environments
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that could have supported microscopic life if it ever existed there.
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The discovery provides new insights into how Mars evolved over time,
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and it highlights the potential of subsurface environments as potential
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sites that search for signs of ancient life beyond.
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Earth this space time.
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And time now to take a brief look at some
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of the other stories making us in science this week.
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With a science report, it's been confirmed that a sixty
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year old man who received a stem cell transplant to
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treat leukemia has now been in HIV one remission for years.
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The findings, reported in the journal Nature, could expand the
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potential stem cell donor pool for achieving HIV clearance. The
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man's the seventh known case of long term HIV remission
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after a stem cell transplant.
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In previous cases.
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Doctors have used stem cell donors with HIV with two
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copies of a mutated gene for the protein HIV one.
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They use these donors stem cells for cancer patients with
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HIV to see if the transplant can also clear their infection.
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In this case, researchers said that donor had just one
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copy of the necessary mutation, and the patient was still
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able to stop HIV medication three years after the transplant,
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remaining HIV free for another three years on. Paleontologists have
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discovered a world record number of fossil dinosaur footprints along
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an ancient Bolivian shoreline. A report in the journal Plus
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one identified some sixteen thousand fossilized dinosaur footprints at the
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one side. The authors say it constitutes a world record
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for the number of individual dinosaur footprints, contenuous trackways, tail traces,
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and swimming traces. The footprints range in size from less
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than ten centimeters to more than thirty centimeters. They record
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a variety of different dinosaur behaviors, including running, swimming, tail dragging,
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and even sharp turns. The authors say that most of
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these tracks are oriented roughly northwest southeast, with ripple marks
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preserved in the sediment, and that suggested these dinosaurs were
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roaming along the ancient shoreline. A new study claims domestic
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house cats only arrived in Europe around two thousand years ago.
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