Rosetta casts doubt on comets as Earth’s water providers

Comet 67P’s atmosphere contains a surprisingly high fraction of deuterium

67P/Churyumov–Gerasimenko

GETTING FUZZY  The basic chemistry of a comet’s thin, hazy atmosphere offers hints about how water got to Earth. It may not have been on the backs of comets like 67P/Churyumov–Gerasimenko.

NAVCAM/Rosetta/ESA (CC BY-SA IGO 3.0)

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