Goldilocks zone
or goldilocks zone
noun
a zone around a star having temperatures and other conditions that can support life on planets: Mars is thought to lie on the outer edge of the sun's Goldilocks zone.
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Origin of Goldilocks zone
after the fairy-tale character Goldilocks
Also called habitable zone.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019