Comet Hartley 2 has a similar ratio of heavy water to ordinary water to Earth, indicating comets may have supplied much of Earth’s water.NASA/JPL-Caltech/UMD
The tide of an ongoing debate about whether comets or asteroids supplied most of Earth’s water has turned back to comets...
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https://skpsoft.com/science/comets-take-pole-position-as-water-bearers-nature-news/
Friday, February 17, 2017
Comets take pole position as water bearers : Nature News
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