Rosetta casts doubt on comets as Earth’s water providers
Comet 67P’s atmosphere contains a surprisingly high fraction of deuterium
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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