Interstellar comet 3I/ATLAS shows water D/H > 6.6×10^{-3}, over 30 times higher than typical Solar System comets, indicating formation under colder conditions in another planetary system.
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Water D/H in 3I/ATLAS as a Probe of Formation Conditions in Another Planetary System
Interstellar comet 3I/ATLAS shows water D/H > 6.6×10^{-3}, over 30 times higher than typical Solar System comets, indicating formation under colder conditions in another planetary system.