NASA’s James Webb Space Telescope detects methane hidden deep inside interstellar comet 3I/ATLAS with unusual carbon dioxide abundance

The view coming back from NASA’s James Webb Space Telescope has a way of turning familiar categories of comet science slightly awkward. 3I/ATLAS, an interstellar object only briefly passing through the solar system, has been watched before, but this time the reading feels less like a routine update and more like a chemical surprise that refuses to sit neatly alongside local comets.

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