Goldilocks effect
attrib.— «Comparative geology between Earth, Venus and Mars. And, hopefully, possibly answering questions where climate and geology are interrelated, like the “goldilocks effect” where Venus is too hot, Mars is too cold, and the Earth is just right.» —“Re: Magellan Update—11/16/90″ by Fraering Philip Usenet: sci.space Nov. 19, 1990. (source: Double-Tongued Dictionary)