Goodbye, Star Traveller: 3I/ATLAS Bids Farewell at Jupiter

In today's episode of Astronomy Daily, Anna and Avery cover six remarkable stories spanning an interstellar farewell, a stunning pre-dawn sky show, a potential new Martian mineral, ghost particles from long-dead stars, a revolutionary new framework for detecting alien life, and the astonishing possibility of habitable moons drifting starless through the galaxy. Stories Covered in S05E64 1. 3I/ATLAS: The Interstellar Comet's Jupiter Farewell: Today marks the closest approach of interstellar comet 3I/ATLAS to Jupiter before it leaves our solar system forever. New ALMA data reveals the comet carries extraordinary levels of methanol — a chemical fingerprint from another solar system entirely. 2. Mercury, Mars & the Moon: Tonight and tomorrow morning, Mercury and Mars gather close to a crescent Moon in the pre-dawn sky. Southern Hemisphere observers have the best view. This week also brings the March equinox (March 20) and heightened aurora activity. 3. A New Mineral on Mars?: Scientists may have discovered a previously unknown mineral hidden in Mars's ancient sulfate deposits. Found by combining laboratory experiments with orbital spectroscopy, the potential discovery could shed new light on Mars's ancient watery past. 4. Ghost Particles from Dead Stars: Japan's upgraded Super-Kamiokande detector may detect the Diffuse Supernova Neutrino Background for the first time in 2026 — a faint signal from every supernova across cosmic history, including stars that exploded before Earth was born. 5. Life, But Not As We Know It: A new framework called Assembly Theory, published today in Universe Today, offers a way to detect alien life that bears no resemblance to life on Earth. Rather than searching for specific biosignature gases, it asks how complex the atmospheric chemistry is — and is designed for the upcoming Habitable Worlds Observatory. 6. Starless Moons: Moons orbiting free-floating planets — worlds ejected from their home solar systems — could sustain liquid water oceans for up to 4.3 billion years, powered by tidal heating and insulated by hydrogen atmospheres. No star required. Astronomy Daily is part of the Bitesz.com Podcast Network. New episodes every weekday. Website: astronomydaily.io Twitter/X: @AstroDailyPod Instagram: @AstroDailyPod TikTok: @AstroDailyPod

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