Do Space Aliens Need Baptism? The View From Gliese 581g
…uid water is a requirement for life. And the habitable zone is a region surrounding a star within which water can exist in its liquid phase. Inside the habitable zone, close to the star, water boils. Beyond the habitable zone, far from the star, water freezes. Astronomers—wits ever—have come to call this region the Goldilocks zone (not too hot, not too cold…). It turns out that we live near the center of the Sun’s Goldilocks zone, and Venus and Ma…
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