Space/Science — HabitableZone

Space/Science » in reply to re: While the "always frozen" Mars scenario

re: Chill

There was a time when the Earth was completely covered with ice (750,000,000 years ago. Before that, life was unicellular, after that, life became much more complex.

We also know the Sun gets hotter with time, which means it was colder in the beginning.

Raoul

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