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

The European mission has discovered that the water locked in Comet 67P/Churyumov-Gerasimenko doesn't match the water on Earth.

December 10, 2014
2:00 PM EST
Artist's impression of Rosetta's Philae lander on Comet 67P/Churyumov-Gerasimenko's nucleus. | ESA/AOES Medialab