Goldilocks zone

or goldilocks zone

noun
  1. 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.

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. 2018