The world's attention is now on Proxima Centauri b, a possibly Earth-like planet orbiting the closest star, 4.22 light-years away. The planet's orbit is just right to allow liquid water on its surface, needed for life. But could it in fact be habitable? If so, the planet evolved very differently than Earth, say researchers say astronomers, geophysicists, climatologists, evolutionary biologists and others who study how distant planets might host life.
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