Goldilocks zone: A guide to the habitable sweet spot

The habitable zone is the region around a star where an orbiting planet could host liquid water and, therefore, possibly support life. 

The habitable zone is also known as the “Goldilocks zone” because planets orbiting at that “just right” distance from a star are not too hot or too cold to host liquid water. If planets are closer to their star, the water turns to steam; if they’re farther, it freezes.

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