Rosetta Spacecraft's Comet Water Discovery: What It Means for Earth

Friday, December 12, 2014 - 12:30 in Astronomy & Space

Where did Earth's water come from? Comets? Asteroids? New data from the Rosetta spacecraft orbiting Comet 67P/Churyumov-Gerasimenko shows that comets — once thought responsible for seeding Earth with water — might not have delivered water to the planet.

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