Interstellar Comet 3I/ATLAS Left a Trail of Methane in its Wake

NASA images showing the interstellar comet 3I/Atlas captured by the Hubble Space Telescope on Nov. 30th, 2025. Credit: NASA/ESA/STScI/UCLAM/SAO/STScI

A new analysis of data obtained by JWST on 3I/ATLAS as it was on its way out of the Solar System (in December 2025) showed that its interior is rich in methane ice.

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