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Habitable-zone definition

The region in a stellar system where the surface temperatures of planets can sustain liquid water and therefore hold the highest probability for the existence of life.
noun
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(astronomy) The zone around a star where a planet could experience temperatures like those on Earth, allowing for the possible existence of liquid water and of life.
noun
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Other Word Forms

Noun

Singular:
habitable-zone
Plural:
habitable zones