Rosetta Findings Suggest Water On Earth’s Oceans Originated From Asteroids, Not Comets

December 11, 2014 8:46 AM

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Rosetta Findings Suggest Water On Earth’s Oceans Originated From Asteroids, Not Comets

The European Space Agency’s (ESA) Rosetta spacecraft has found that water vapor generated by its target comet “67P/Churyumov-Gerasimenko” is significantly different from that found on Earth, a discovery that has fueled speculation that asteroids, not comets, were likely responsible for the planet’s ancient oceans.

One of the leading hypotheses about the origin of water on Earth is that the planet’s surface was inundated with water by a bombardment of comets about 3.8 billion years ago. But, the new data provided by Rosetta has led scientists to reconsider the theory and speculate that ancient asteroids, which...

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