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  1. Duh! Of course size isn’t the major determinant of whether a planet is earth-like. It should be similar in size for life to exist, due to gravity’s effect on any living creatures. Scientists talk about “the temperate zone” of planets: how far they are from their suns, the temperature ranges, and whether the planet is rocky with an ocean of water. I read that the size should not exceed about 1.5 times that of earth.

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