Dec. 21, 2024
Satellite Fragmentation Woes, SpaceX's Payload Parade, and Mars's Explosive Spring: S03E238
Astronomy Daily - The Podcast: S03E238
Welcome to Astronomy Daily, your trusted source for the latest in space and astronomy news. I'm your host, Anna, and today we have an enthralling lineup of stories that take us from the complexities of Earth's...
Astronomy Daily - The Podcast: S03E238
Welcome to Astronomy Daily, your trusted source for the latest in space and astronomy news. I'm your host, Anna, and today we have an enthralling lineup of stories that take us from the complexities of Earth's orbit to the explosive changes on Mars.
Highlights:
- Orbital Breakup Drama: Dive into the concerning fragmentation of the retired military weather satellite DMSP5D 2F14, which added over 50 pieces of debris to Earth's orbit. Understand the ongoing challenges posed by similar satellites and the inherent design flaws that lead to these breakups.
- SpaceX's Bandwagon 2 Mission: Get ready for SpaceX's upcoming rideshare mission, carrying an impressive 30 payloads, including a radar satellite for South Korea's 425 project. Discover the diverse capabilities and missions of these small satellites.
- Mars' Explosive Spring: Explore the dramatic seasonal changes on Mars, from frost avalanches to powerful geysers, as captured by NASA's Mars Reconnaissance Orbiter. Learn about the planet's unique atmospheric phenomena during its spring thaw.
- Rethinking Dark Energy: Delve into new research from the University of Canterbury that challenges the conventional understanding of dark energy, proposing a "timescape" model to explain the universe's accelerating expansion without invoking dark energy.
- The Dinosaur Extinction Debate: Revisit the age-old debate on the extinction of dinosaurs with new insights from recent research, highlighting the role of the Chicxulub meteorite impact over volcanic eruptions.
For more cosmic updates, visit our website at astronomydaily.io. Sign up for our free Daily newsletter to stay informed on all things space. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTubeMusic, Tumblr, and TikTok. Share your thoughts and connect with fellow space enthusiasts.
Thank you for tuning in. This is Anna signing off. Until next time, keep looking up and stay curious about the wonders of our universe.
00:00 - Today's featured news includes orbital drama and seasonal changes on Mars
00:58 - A defunct military weather satellite experienced a low velocity fragmentation event on December 18
02:59 - SpaceX is gearing up for an exciting rideshare mission on December 21
05:09 - Mars is experiencing a spectacular spring awakening that's far more dramatic than Earth
07:50 - New research challenges belief that dark energy is behind accelerating universe
10:03 - Scientists have long debated whether volcanic eruptions or a catastrophic meteorite caused extinction
12:19 - This episode of Astronomy Daily explores the wonders of space
✍️ Episode References
SpaceX
https://www.spacex.com/
NASA Mars Reconnaissance Orbiter
https://mars.nasa.gov/mro/
LeoLabs
https://leolabs.space/
University of Canterbury
https://www.canterbury.ac.nz/
Utrecht University
https://www.uu.nl/en
University of Manchester
https://www.manchester.ac.uk/
Deccan Traps
https://en.wikipedia.org/wiki/Deccan_Traps
Chicxulub Meteorite
https://en.wikipedia.org/wiki/Chicxulub_crater
Defense Meteorological Satellite Program
https://en.wikipedia.org/wiki/Defense_Meteorological_Satellite_Program
NOAA
https://www.noaa.gov/
Become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-the-podcast--5648921/support.
WEBVTT
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Welcome to Astronomy Daily.
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I'm excited to bring you another fascinating day of space
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and astronomy news. There's quite a bit to cover today,
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from orbital drama to seasonal changes on the Red planet.
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We'll start with a concerning development in Earth orbit, where
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a retired military weather satellite has broken up into dozens
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of pieces, adding to a pattern of similar incidents with
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these particular spacecraft. Then we'll look ahead to SpaceX's upcoming
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Bandwagon two mission, which will carry an impressive array of
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thirty different payloads into orbit, including an advanced.
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Radar satellite for South Korea.
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We'll also take a journey to Mars, where NASA's Mars
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Reconnaissance Orbiter has been capturing some incredible seasonal phenomena. Unlike
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Earth's gentle seasonal transitions, Mars experiences some remarkably explosive changes
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during its spring thaw, and I can't wait to tell
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you all about them. Plus, we've got to look at
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a new theory about that mysterious dark energy, and we'll
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revisit an age old debate with some new research.
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So let's get started.
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In a concerning development, the US Space Force has reported
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that a defunct military weather satellite experienced what they're calling
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a low velocity fragmentation event on December eighteenth. The incident
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occurred at an altitude of about eight hundred and forty kilometers,
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creating more than fifty pieces of trackable debris, according to
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radar observations from commercial space monitoring company Leo Labs. The
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satellite in question, known as DMSP five D two F fourteen,
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was launched back in nineteen ninety seven as part of
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the Defense Meteorological Satellite Program. After serving its purpose for
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over two decades, it was retired in twenty twenty, but
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remained in its Sun synchronous orbit. Weighing about seven hundred
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and fifty kilograms, this spacecraft is now the latest in
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a series of similar satellites to meet this unfortunate fate.
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What's particularly concerning is that this isn't an isolated incident.
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Several other satellites from the same family have experienced similar
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breaks make ups over the years. In October twenty sixteen,
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the F twelve satellite broke apart, following the fragmentation of
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F thirteen. In February twenty fifteen, going back even further,
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the F eleven spacecraft created fifty six pieces of tracked
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debris when it broke up in two thousand four. The
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root cause appears to be a known design flaw in
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these satellites battery assemblies that makes them vulnerable to explosion.
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This issue isn't limited to military satellites either. Similar civilian
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weather satellites operated by Noah have suffered the same fate,
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with Noah sixteen breaking up in twenty fifteen and Noah
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seventeen following suit in twenty twenty one. Most troubling is
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that these breakups occurred despite attempts to prevent them through
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a process called passivation, where satellites are prepared for decommissioning
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by draining their batteries and venting fuel tanks.
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Industry experts note.
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That this process may not be fully effective on older
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satellites that were designed before modern orbital debris mitigation practices
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were established. Next up, SpaceX is gearing up for an
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exciting ride share mission from Vandenberg Space for Space in California.
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The Bandwagon two mission, scheduled for a three thirty four
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am Pacific launch on December twenty first, will carry an
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impressive array of thirty different payloads to orbit the Star
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of this mission is a sophisticated radar satellite for South Korea,
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capable of seeing through clouds and darkness to capture detailed
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images of Earth. This spacecraft is part of South Korea's
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four hundred and twenty five project, a constellation of military
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Earth observation satellites that combines both optical and radar imaging capabilities.
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Among the other fascinating payloads are two satellites from Ice
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that will join their radar imaging constellation, and a trio
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of satellites from Hawkeye three hundred and sixty that will
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work together to pinpoint radio frequency transmissions from orbit. Two
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compact weather satellites from tomorrow dot Io will collect valuable
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atmospheric data, while LIZZISATI will test out new imaging and
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computing technologies in space. The mission will use Falcon nine
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booster B one THY seventy one, making its twenty first flight.
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After sending its passengers on their way, the booster will
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return to land at landing Zone four, right next to
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its launch pad. The second stage will perform a carefully
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choreographed series of burns to deploy the satellites at two
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different altitudes, most at five hundred and ten kilometers and
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the South Korean satellite at five hundred and seventy kilometers.
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This launch represents SpaceX's one hundred thirty first Falcon mission
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of the year, marking an incredibly busy period for the company.
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It's also their second dedicated ride share mission to a
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mid inclination orbit, specifically chosen to keep these satellites positioned
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over more populated areas of our planet rather than following
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the polar orbits typically used for Earth observation missions. After deployment,
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these satellites will begin their diverse missions from Earth imaging
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and weather monitoring, to testing new space technologies and providing
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communications serve vises. Together, they represent a remarkable snapshot of
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the increasing variety and capability of small satellites being launched today.
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Ever thought about the concept of seasons on other planets.
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While we're celebrating the approaching new year here on Earth,
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Mars has already completed its journey around the Sun, marking
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the end of its six hundred and eighty seven Earth
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Day year this past November. But unlike Earth's northern winter
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wonderland or southern hemispheres summer, Mars is experiencing a spectacular
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spring awakening that's far more dramatic than anything we see
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here at home. Instead of gentle snow melt and trickling streams,
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Mars puts on an explosive show. The red planet's thin
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atmosphere means ice doesn't gradually melt into liquid. It transforms
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directly into gas in a process called sublimation. This creates
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some truly remarkable phenomena that NASA's Mars Reconnaissance orbiter has
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been tracking for nearly two decades. One of the most
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dramatic events are the frost avalanche. Imagine witnessing a massive
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chunk of carbon dioxide frost wider than a house, breaking
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free and tumbling down Martian cliffs. The orbiter's high resolution
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cameras actually captured one of these spectacular events, showing a
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sixty six foot wide block of dry ice in freefall.
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But that's just the beginning. As spring temperatures rise, pressurized
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carbon dioxide gas builds up beneath the surface ice until
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it literally explodes upward, creating powerful geysers that blast dark
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fans of sand and dust into the Martian sky. These
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explosive jets leave behind distinctive patterns in the soil that
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when viewed from orbit, look remarkably like giant spider legs
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etched into the surface. Perhaps most impressive is the planet's
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northern ice cap, a structure as large as Texas that
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features enormous spiral troughs carved by powerful seasonal winds. Some
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of these troughs stretch as long as California, dwarfing similar
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features found in Antarctica. As the spring thaw begins, these
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channels become super highways for warm wind gusts that gain
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speed and heat as they race downhill. These same winds
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are constantly reshaping Mars's landscape, particularly its sand dunes. During winter,
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carbon dioxide frost locks these dunes in place, but once
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spring arrives and the frost sublimates, they begin their slow
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migration across the Martian surface. It's a seasonal dance that's
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been ongoing for eons, sculpting and reshaping the face of
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our neighboring planet. What makes this even more fascinating is
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that each Martian spring is unique, with subtle variations in
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temperature and timing creating different patterns of sublimation and surface activity.
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It's a reminder that Mars, despite its apparent desolation, is
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a dynamically changing world with its own distinctive seasonal rhythm. Now,
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let's dive into a topic that's been puzzling scientists for
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decades dark energy. For years, the term dark energy has
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been used to describe the mysterious force believed to drive
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the accelerated expansion of our universe. It's thought to make
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up about two thirds of the universe's total mass energy content. However,
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recent research from the University of Canterbury in christ Church,
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New Zealand challenges this long standing concept. Led by Professor
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David Wiltshire, the team analyzed supernova light curves with enhanced precision.
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Their findings suggest that the universe's expansion isn't uniform, but
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rather lumpy, varying in different regions. This challenges the conventional
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lambda cold dark matter model, which relies on dark energy
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to explain the universe's accelerating expansion. The researchers propose an alternative,
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the timescape model. This model considers that gravity affects time,
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causing clocks and regions with different gravitational strengths to tick
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at varying rates. For instance, a clock in the emptiness
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of space would run faster than one within a galaxy.
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These time differences could lead to the perception of an
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accelerating universe without invoking dark energy. Professor Wiltshire explains our
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findings show that we do not need dark energy to
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explain why the universe appears to expand at an accelerating rate.
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He suggests that what we've been interpreting as dark energy
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might actually be variations in the kinetic energy of expansion
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influenced by the universe's lumpy structure. This perspective also offers
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insights into the Hubble tension, the discrepancy between the current
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expansion rate of the universe and predictions based on early
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universe observations. By accounting for regional variations and expansion, the
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Timescape model could bridge this gap. While these findings are compelling,
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they don't entirely dismiss the existence of dark energy. Instead,
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they encourage a reevaluation of our cosmological models and highlight
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the importance of considering the universe's complex structure in our calculations.
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As we continue to explore these cosmic mysteries, each discovery
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brings us closer to understanding the true nature of our universe.
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It's a thrilling reminder of how much there is yet
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to learn. Finally, today, let's revisit a classic debate, what
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really caused the extinction of the dinosaurs. For decades, scientists
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have pondered whether massive volcanic eruptions or a catastrophic meteorite
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impact led to the dinosaur's demise. Recent research from utrect
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University and the University of Manchester sheds new light on
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this mystery. The study focuses on the Deccan Traps in India,
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where colossal volcanic eruptions occurred around sixty six million years ago.
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These eruptions released vast amounts of sulfur and carbon dioxide,
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potentially altering the global climate. By analyzing fossil molecules from
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ancient peats in the United States, scientists reconstructed air temperatures
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during this period. They discovered that a significant volcanic eruption
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about thirty thousand years before the meteorite impact caused a
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global cooling of approximately five degrees celsius. However, temperatures rebounded
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twenty thousand years before the impact, likely due to volcanic
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CO two emissions. This timeline suggests that while these volcanic
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events had drastic consequences, for life on Earth. Their climatic
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effects had dissipated thousands of years before the chi Salub
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meteorite struck. Therefore, the meteorite impact remains the primary culprit
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behind the mass extinction event that wiped out the dinosaurs.
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Lauren O'Connor of Utrecht University notes these volcanic eruptions and
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associated CO two and sulfur releases would have had drastic
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consequences for life on Earth, but these events occurred millennia
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before the meteorite impact and probably played only a small
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part in the extinction of dinosaurs. This research underscores the
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catastrophic impact of the Chisalub meteorite, which unleashed wildfires, earthquakes, tsunamis,
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and an impact winter that blocked sunlight and devastated ecosystems.
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Understanding these events helps us piece together Earth's complex history
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and the factors that have shaped life on our planet.
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It's a fascinating reminder of the dynamic forces at play
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over geological timescales, and that wraps up today's fascinating journey
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through space, from Earth orbiting satellite breakups to SpaceX's ambitious
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ride share mission and the dramatic spring spectacle unfolding on Mars.
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I'm Anna and I hope you've enjoyed this episode of
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Astronomy Daily. If you're hungry for more space content, I've
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got great news for you. Head over to Astronomy Daily
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While you're there, you can also catch up on all
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engage with you about all things space. Thank you for
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spending time with us today exploring the wonders of space.
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Until next time, keep looking up and stay curious about
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our cosmic neighborhood.
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Sunny Day Star is so.
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Star is Star
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