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Goldilocks planet (s) (noun), Goldilocks planets (pl)
A planet that can support life: A Goldilocks planet is neither too hot nor too cold, neither too big nor too small, and neither too near its star nor too far.

A Goldilocks planet is one whose size, temperature and composition are all just right to maintaine life.

This entry is located in the following unit: Astronomy and related astronomical terms (page 12)