The moon may have stopped the early Earth from being a frozen snowball

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The young Earth and moon


The sun is thought to have once been far fainter than it is today, which should have left Earth frozen as a global snowball. That it wasn’t, a discrepancy known as the faint young sun paradox has long plagued astronomers, but now we might have an answer: the moon helped keep Earth warm.
Models of the sun’s past suggest it was up to 70 percent dimmer in its first 100 million years. New Scientist reports.

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