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flag Interstellar comet 3I/ATLAS releases 120 times more methanol than hydrogen cyanide, revealing unique chemistry unlike any solar system comet.

flag Interstellar comet 3I/ATLAS, the third known object from another star system to visit our solar system, is releasing unusually high levels of methanol—up to 120 times more than hydrogen cyanide—according to ALMA observations in late 2025. flag The comet’s coma, formed as sunlight warmed its icy surface, shows methanol emissions from both its nucleus and icy particles, a phenomenon not seen before in interstellar objects. flag Its chemistry, including a coma dominated by carbon dioxide and traces of nickel without iron, differs sharply from solar system comets. flag Scientists believe the extreme methanol levels suggest it formed in a colder, chemically distinct environment, offering rare insights into planetary formation beyond our solar system.

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