First spacecraft to orbit comet changes theory of origin of Earth’s water

December 13, 2014 2:26 AM

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For a long time, most thought that water was brought to Earth when comets and asteroids impacted the Earth’s surface. However, data retrieved from a spacecraft that is currently on a comet would suggest otherwise, according to NASA.

The European Space Agency’s Rosetta spacecraft has a special instrument hooked up to it–the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis–that was able to determine that the composition of water vapor on the comet 67P/Churyumov-Gerasimenko has a significantly different chemical makeup th...

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