PerspectiveCOSMOCHEMISTRY

The origins of water

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Science  28 Aug 2020:
Vol. 369, Issue 6507, pp. 1058
DOI: 10.1126/science.abc1338

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Summary

Our blue planet having water seems such a simple and obvious fact that the question of why Earth has water at all feels like a trivial one. However, the origin of this key ingredient for life has remained a long-standing topic of debate. According to models of Solar System formation, Earth, as an inner Solar System planet, should have little to no water. On page 1110 of this issue, Piani et al. (1) analyze enstatite chondrite meteorites, a material similar to Earth's main building blocks, and address the origins of Earth's water.

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