Rosetta Comet Mission Reveals Clues About the Origin of Earth’s Water

December 10, 2014 7:00 PM

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One of the theories for how Earth became a watery world suitable for life now faces doubt, according to the latest results from the Rosetta spacecraft that’s now orbiting a comet 326 million miles away.

Countless comet impacts were thought to have delivered water to Earth not long after the planet formed 4.6 billion years ago. But new measurements from Rosetta, which is studying comet 67P/Churyumov-Gerasimenko, reveal that the chemical signature of water in the comet is nothing like what’s found in...

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