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Scientific American

Like Ancient Snowball Earth, Frozen Planets May Still Be Habitable

13 Mar 2018, 10:45 UTC
Like Ancient Snowball Earth, Frozen Planets May Still Be Habitable NASA/JPL-Caltech

Roughly 650 million years ago vast sheets of glaciers stretched from the poles to the tropics, entombing Earth within a frozen skin that lingered for millions of years.

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