Goldilocks zone
 attrib.— «A planet orbiting a star at the right distance to stay suitably cosy is therefore said by astronomers to be in the star’s “Goldilocks zone”—or, when they are being more serious, the “habitable zone.”» —“All Possible Worlds” Economist (U.K.) Jan. 25, 1997. (source: Double-Tongued Dictionary)

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