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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