ALMA Observations Reveal an Exceptionally High Methanol-to-HCN Ratio in Interstellar Comet 3I/ATLAS

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ALMA found that interstellar comet 3I/ATLAS has a methanol-to-HCN ratio around 70 on one date and 120 on another, with methanol coming from both icy grains and the nucleus and HCN mainly from the core, a chemistry unusual for solar system comets, while JWST shows CO2 dominates when far away and methanol and HCN rise as it warms, pointing to broader comparative planetology as more interstellar visitors are found, led by Nathan Roth.