Extreme Deuterium Enrichment in 3I/ATLAS's Organic Molecules Signals a Very Cold Interstellar Origin

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3I/ATLAS contains unusually large amounts of deuterium in its molecules, especially methane, indicating it formed in very cold space, though the exact origin is still debated.

Webb Telescope Detects Unusually High Levels of Heavy Hydrogen, a Key Component of Nuclear Fusion Fuel, in 3I/ATLAS
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Webb Telescope Detects Unusually High Levels of Heavy Hydrogen, a Key Component of Nuclear Fusion Fuel, in 3I/ATLAS

New data from the James Webb Telescope has identified an unusually high concentration of deuterium in the interstellar comet 3I/ATLAS.