The region around a star within which planetary-mass objects with sufficient atmospheric pressure can support liquid water at their surfaces.

The habitable zone is the region around a star within which planetary-mass objects with sufficient atmospheric pressure can support liquid water at their surfaces.

The habitable zone is also called the Goldilocks zone, a metaphor of the children's fairy tale of Goldilocks and the Three Bears, in which a little girl chooses from sets of three items, ignoring the ones that are too extreme (large or small, hot or cold, etc.), and settling on the one in the middle, which is "just right".

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