March 6, 2026
Moon Safe! Asteroid Threat Ends + Cosmic Laser Record + Solar Storm Hits Mars
Astronomy Daily — S05E55 | 6 March 2026 Six stories today covering planetary defence, a cosmic laser record, a solar superstorm on Mars, space debris pollution, a mystery satellite launch, and the most charming farming experiment you'll hear about all year. Stories This Episode 1. Asteroid 2024 YR4 — Moon Impact Officially Ruled Out NASA has confirmed, using the James Webb Space Telescope, that infamous asteroid 2024 YR4 will not hit the Moon in 2032. The space rock — once the most dangerous asteroid identified in two decades — will instead pass the Moon at a distance of around 13,200 miles. It previously held a 4% lunar impact probability, now fully eliminated thanks to Webb's extraordinary sensitivity pushing it to the limits of what the telescope can observe. 2. MeerKAT Detects Cosmic 'Gigalaser' 8 Billion Light-Years Away South Africa's MeerKAT radio telescope has spotted the most distant hydroxyl megamaser ever detected — a natural 'space laser' in a galaxy undergoing a violent collision more than 8 billion light-years away. The signal is so powerful it qualifies as a gigamaser. Adding to the serendipity, the signal was further amplified by a foreground galaxy acting as a gravitational lens on its 8-billion-year journey to Earth. The discovery points toward the future capability of the Square Kilometre Array (SKA). 3. ESA's Mars Orbiters Record Solar Superstorm Hitting Mars A new Nature Communications study reveals what happened when the record-breaking May 2024 solar superstorm hit Mars. ESA's Mars Express and ExoMars Trace Gas Orbiter recorded unprecedented electron density spikes in the Martian upper atmosphere — up to 278% above normal — and both spacecraft experienced computer glitches from the energetic particles. The study uses a novel spacecraft-to-spacecraft radio occultation technique and highlights how Mars's lack of a global magnetic field leaves it vulnerable to solar events in ways that Earth is not. 4. SpaceX Falcon 9 Re-entry Directly Linked to Atmospheric Lithium Plume For the first time, scientists have directly tied a specific rocket re-entry to a measurable atmospheric pollution event. Researchers at the Leibniz Institute for Atmospheric Physics detected a tenfold spike in lithium vapour in the upper atmosphere — from 3 to 31 atoms per cubic centimetre — in the hours following the uncontrolled re-entry of a Falcon 9 upper stage off Ireland in February 2025. Eight thousand backward atmospheric simulations confirmed the connection. Published in Communications Earth & Environment, the paper raises important questions about the growing chemical footprint of the commercial space industry. 5. Rocket Lab Launches Mystery Satellite — 'Insight at Speed is a Friend Indeed' Rocket Lab completed its 83rd Electron launch from New Zealand, deploying a single satellite for a confidential commercial customer to an orbit 470 km above Earth. The company announced the mission just hours before liftoff, offering no further details on the customer or the payload's purpose. 6. Scientists Grow Chickpeas in Simulated Moon Dirt for First Time Researchers at the University of Texas at Austin and Texas A&M University have successfully grown and harvested chickpeas in simulated lunar regolith — the first time this has ever been achieved. Using a combination of vermicompost (worm castings) and arbuscular mycorrhizal fungi to condition the otherwise toxic, sterile moon dirt, the team produced flowering, seed-bearing plants in soil mixtures of up to 75% regolith simulant. The chickpeas have not yet been cleared for eating pending metal accumulation testing — but the team's goal of 'moon hummus' is, apparently, very much alive. Find Us: astronomydaily.io | @AstroDailyPod on all platforms Subscribe & Review: Apple Podcasts · Spotify · YouTube · everywhere you listen
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WEBVTT
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Hey, everyone, Welcome back to Astronomy Daily.
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I'm Ana and I'm Avery. Happy Friday, space fans, We've
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got a great one for you today.
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We do six stories, and honestly, this is one of
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the more varied lineups we've had in a while. We've
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got planetary defense, a cosmic laser from halfway across the universe,
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a solar superstorm hitting Mars, a SpaceX rocket polluting the
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atmosphere on its way.
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Down, a mystery satellite launch from the other side of
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the world, and my personal favorite scientists trying to grow
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chickpeas on the moon.
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Bon hummus. Avery, that's where we're headed.
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Moon hummus. Let's go.
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Okay, First up, great news for anyone who's been losing
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sleep over asteroid twenty twenty four y R four. NASA
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has now officially ruled out any chance of it hitting
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the Moon in twenty thirty two.
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Right, So let's quickly recap the story for anyone who
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hasn't been following it. This asteroid was discovered back in
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December twenty twenty four, and for a while it was
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genuinely alarming. It briefly became the most dangerous asteroid identified
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in the last twenty years with a small but very
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real chance it could hit Earth.
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That Earth impact risk was ruled out fairly quickly, but
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when the asteroid faded from view last year, astronomers were
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left with something almost as intriguing, a lingering four percent
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chance it could strike the Moon on December twenty second,
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twenty thirty two.
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Four percent sounds small, but in asteroid terms, that's enormous.
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We're talking about a sixty meter rock, roughly the same
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size as what caused the Tenguska event in nineteen oh eight,
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or what dugout meteor crater in Arizona. If it hit
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the near side of the Moon, it would have created
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a crater about a kilometer wide and put on the
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most spectacular light show humanity has ever seen from Earth.
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So everyone's been watching very closely. The problem was by
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spring last year, the asteroid had drifted so far away
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it was invisible to pretty much every telescope on Earth
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and in space, with one exception.
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The James Web Space Telescope, which pushed itself to its
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very limits To catch this thing. A team led by
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the JOHNS. Hopkins Applied Physics Laboratory used Web's near infrared
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camera in two observation windows in February the eighteenth and
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the twenty six to track down this incredibly faint speck
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against the background of stars.
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And the result was clear. The new measurements allowed scientists
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to map twenty twenty four y are forest trajectory with
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enough precision to rule out a lunar collision. Instead of
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hitting the Moon, It's going to pass at a distance
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of about thirteen thousand, two hundred miles from the lunar surface,
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which is yes, closer than some satellites orbit Earth, but
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it's a miss.
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Thirteen thousand, two hundred miles is basically next door in
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astronomical terms, but next door is still a miss. The
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Moon is safe, Earth is safe, and twenty twenty four
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yr four is just gonna keep trucking.
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NASA says they'll observe it again when it swings back
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near Earth in twenty twenty eight, So the story isn't
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quite over, but for now the threat is officially off
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the table.
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Good news to kick off the show What's next?
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Okay? Story two. This one comes out of South Africa
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and it involves what scientists are describing as a cosmic laser.
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And I mean that almost literally.
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Tell me more lasers in space. Sounds like something I
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need in my life.
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So astronomers using the Meerkat radio telescope in the Karu
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Desert have detected the most distant hydroxyl megamazer ever found.
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It's located in a violently merging galaxy four than eight
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billion light years away, and the signal is so powerful
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that researchers are actually calling it a gigamaser rather than
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a megamser.
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Okay, let's break this down for people. What exactly is
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a hydroxyl megamser?
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Right, So, on Earth, a laser works by exciting atoms
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or molecules until they release light in a very tight
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amplified beam. The same basic physics can happen in space,
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but instead of visible light, it happens at radio wavelengths.
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Hydroxyl molecules that's one hydrogen, one oxygen in massive gas
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clouds can be excited by the energy of colliding galaxies
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and amplify radio waves in exactly the same way. When
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the signal is extraordinarily bright, it's called a megamaser.
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So it's a natural radio laser powered by two galaxies
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smashing into each other.
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Exactly, and the one mirror caatound cataloged as hat Las
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J one four two nine three five point three dash
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zero zero two eight three six is the most distant
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and luminous example ever detected. We're seeing it as it
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existed when the universe was less than half its current age.
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And you said there was a gravitational lens involved as well.
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Yes, this is the really lovely part of the story.
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On its eight billion year journey to Earth, the radio
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signal happened to pass directly behind another completely unrelated galaxy
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sitting between us and the source. That foreground galaxy's gravity
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bent and warped space around it, acting like a natural
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magnifying glass and amplifying the signal even further before it
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reached Meerkat. So we have a natural space laser being
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focused by a natural gravitational telescope.
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That is genuinely delightful. The universe just handed astronomers a
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cosmic gift.
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The lead researcher, doctor Thoto Monomela, from the University of Pretoria,
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described it beautifully. He said they were seeing the radio
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equivalent of a laser halfway across the universe, and that
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it was a wonderfully serendipitous discovery.
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And the bigger picture here is that Meerkat is a
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precursor to the square kilometer array, the SKA, which is
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going to be even more powerful. So this is just
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a start of what's possible exactly.
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Bonamella's team wants to find hundreds, even thousands of these objects,
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and when the SKA comes online, that's going to become
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a real possibility.
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Incredible, all right.
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Story three and a bit of recent space history.
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Story three takes us back to May twenty twenty four
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and to Mars. You might remember that in May twenty
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twenty four, Earth was hit by the biggest solar storm
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recorded in over twenty years. Spectacular auroras were seen as
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far south as Mexico.
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I remember it well. Half the world was posting aurora photos, right.
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But that same storm also slammed into Mars. And thanks
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to Issa's two Mars orbiters, Mars Express and Exo Mars
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Trace Gas Orbital, we now know in unprecedented detail what
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that actually looked like. A new paper published today in
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Nature Communications reveals a full picture.
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So what happened to Mars?
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In short, Mars got absolutely hammered. The storm sent fast moving,
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energetic magnetized plasma and X rays flooding towards the red planet.
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When this barrage hit Mars's upper atmosphere, it stripped electrons
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from neutral atoms, causing two distinct layers of the atmosphere
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to fill up with charged particles at altitudes of around
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one hundred and ten and one hundred and thirty kilometers.
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How much of an effect are we talking?
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The electron density in those layers surged by forty five
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percent in one and a whopping two hundred and seventy
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eight percent in the other. Lead author Jacob Parrott from
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ISSA described it as the biggest response to a solar
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storm ever seen at Mars.
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And the orbiters themselves were affected too.
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Write they were both spacecraft suffered computer errors from the
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energetic particles, which is a known hazard of space weather,
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But crucially both had been designed with radiation resistant components
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and error correction systems, so they recovered fast and the
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time was incredibly fortunate. The researchers were able to capture
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the aftermath of the storm using a technique called radio
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ocultation just ten minutes after a large solar flare hit Mars.
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Radial occultation for our listeners that's where one spacecraft beams
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a radio signal to another at precisely the moment it
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disappears over the planet's horizon. The signal gets bent by
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the atmosphere on the way, and scientists can read all
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sorts of information about the atmospheric layers from the way
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it bends.
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It's a technique that's been used for decades here at Earth,
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but only recently has it been applied between two spacecraft
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that Mars. This was a perfect demonstration of how powerful
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it can.
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Be, and there's a broader significance here, isn't there. Mars
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has no global magnetic field the way Earth does, which
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is why the storm hits so much harder.
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Exactly on Earth, our magnetic field deflects a lot of
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the solar particles and channels the rest toward the poles
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as auroras. Mars lost its magnetic field billions of years ago,
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and that's almost certainly why it also lost most of
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its atmosphere and its liquid water over time. This study
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helps us understand that ongoing process, and it has very
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practical implications for future crude missions and radar operations on
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and around Mars.
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Really fascinating staff.
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Okay story four, and this one has a bit more
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of an edge to it.
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So this story starts with a SpaceX Falcon nine upper
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stage that back in February twenty twenty five failed to
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execute its planned de orbit burn after delivering twenty two
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Starlink satellites to orbit. It drifted uncontrolled for eighteen days
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before beginning an uncontrolled re entry about one hundred kilometers
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off the west coast of Ireland.
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I remember this one. Some debris came down in Poland,
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which caused a fairly significant diplomatic incident. Poland dismissed its
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head of Space agency over the lack of communication about
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where the thing was going to land.
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Right. But now there's a new dimension to this story.
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A paper just published in Communications, Earth and Environment by
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Robin Wing and her colleagues at the Leibnitz Institute for
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Atmospheric Physics in Germany has for the first time ever
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directly tied a specific rocket re entry to a measurable
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atmospheric pollution plume.
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How did they do that?
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They were operating a highly sensitive resonance fluorescence led our
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system in Kulan's Born, Germany, essentially a laser based atmospheric
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monitoring instrument. They weren't specifically watching for the rocket, they
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were just doing their regular atmospheric observations. But right around
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midnight on the twentieth of February twenty twenty five, just
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twenty hours after the Falcon nine came down, they detected
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a spike in lithium vapor levels in the upper atmosphere.
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Lithium, which which is not something that should be up
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there in any quantity.
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Normally, lithium in the upper atmosphere sits at about three
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atoms per cubic centimeter. They measured a spike to thirty
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one atoms per cubic centimeter at an altitude of between
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ninety four and ninety seven kilometers. That's a tenfold increase.
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And lithium is in the rocket because.
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Falcon nine upper stages carry an estimated thirty kilograms of
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lithium in lithium ion batteries and in the aluminum lithium
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alloy that makes up the whole plating. Critically, that alloy
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starts melting at precisely ninety eight point two kilometers altitude,
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which matches exactly where the pollution cloud was detected.
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That's a pretty compelling fingerprint. But did they need to
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do more than just say, well, there's lithium up there
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and a rocket just fell down.
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They did. They ran eight thousand simulations of backward wind
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trajectories from the light our station in Germany all the
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way back to the re entry point over Ireland. They
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checked every other possible source and everything pointed to the rocket.
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The case is solid.
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So what are the implications. Is a lithium cloud in
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the upper atmosphere a big deal?
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That's actually still an open question, and the researchers are
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honest about that. We don't yet fully understand the impact
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on atmosphere chemistry. But what this paper represents is a first.
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It's the first time a specific re entry event has
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been directly linked to a specific pollution plume. And with
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the growth of mega constellations hundreds and eventually thousands of
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satellites being launched and diorbited, this is going to become
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an increasingly important area of study.
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And presumably we need to start thinking about whether controlled
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re entries can be designed to minimize this kind of
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chemical contamination exactly.
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That's the question the paper ends with. It's not alarmist,
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it's more of a we need to start measuring this
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properly moment, which this paper very much is good.
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Story five slightly.
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Lighter, it's mystery launch time.
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Okay, story five. Rocket Lab launched an electron rocket from
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its New Zealand site yesterday evening local time, marking the
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company's eighty third launch to date. The mission is called
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Insight at Speed is a friend, indeed, which is exactly
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the kinds of cryptic mission name that drives people absolutely
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mad on the space forums.
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What do we know about it?
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