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Interstellar comet 3I/ATLAS releases 120 times more methanol than hydrogen cyanide, revealing unique chemistry unlike any solar system comet.
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.
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.
Its chemistry, including a coma dominated by carbon dioxide and traces of nickel without iron, differs sharply from solar system comets.
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.
El cometa interestelar 3I/ATLAS libera 120 veces más metanol que cianuro de hidrógeno, revelando una química única a diferencia de cualquier cometa del sistema solar.