Rosetta: Earth's Water Didn't Come from Comets

Europe’s Rosetta mission has only been in orbit around Comet 67P/Churyumov-Gerasimenko for a few months but it’s already shed light on one of the central questions it was launched, ten years ago, to answer: Where did Earth’s water come from?

Based on evidence of the comet’s water, Rosetta scientists announced this week that it adds evidence that, contrary to prevailing theory, comets didn’t supply Earth with its water. The new findings instead suggest that asteroids were the likely bearer

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