"The sun would have been too faint 3.8 billion years ago for life to evolve. (#C542)
Some suggest that the sun would have been 6% fainter prior to the Cambrian period, and up to 20-30% fainter before that. This is more than enough to plunge the earth into runaway glaciation with no way to recover, thus preventing life from ever forming up to the present. 1 2
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