How Did Earth Get Its Water? Scientists Now Look to 'Hyperactive' Comets for Clues
Fresh observations of Comet 46P/Wirtanen, which swung by Earth in December 2018, suggest that more of Earth's water came from comets than previous studies suggested.
from Space.com http://bit.ly/2JLNeEu
from Space.com http://bit.ly/2JLNeEu
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