On Earth, the volcanoes filled the air with water vapor and carbon dioxide. They were “Goldilocks planets,” our own astronomers would say: just right for life. They were large enough to hold their gases close, swaddling themselves in atmosphere small enough to stay solid, never swelling into gaseous giants. Had an alien astronomer swivelled his telescope toward them in those days, he might have found them equally promising-nurseries in the making. Both were blistered with volcanoes and etched with watercourses both circled the same yellow dwarf star-close enough to be warmed by it, but not so close as to be blasted to a cinder. Like fraternal twins, they were born at the same time, about four and a half billion years ago, and took roughly the same shape. There once were two planets, new to the galaxy and inexperienced in life.
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