“It lives.” And his successors often took him at his word: the sharper their telescopes, the blurrier their vision. “The planet is not a desert of arid rocks,” he wrote. Peering through his telescope on the roof of the Palazzo di Brera, in Milan, Schiaparelli had seen what looked like oceans, continents, and water channels swim into view. He labelled one region Eden, another Elysium, others, on later maps, Arcadia and Utopia. In 1877, when the Italian astronomer Giovanni Schiaparelli drew the first detailed map of Mars, he imagined the planet as an earthly paradise. But like most creation stories this one is also a cautionary tale. It seems inevitable now: life’s triumphant march toward complexity, toward us. Geologists call this the Great Oxygenation Event-the most momentous change in the planet’s history. The first bacteria moved through the ooze then came blue-green algae, spreading across the planet like a watery carpet, drinking in sunlight and exhaling oxygen, giving breath to everything that came after. In hot springs and undersea vents, simple carbon compounds bubbled up to form amino acids and peptides. The surface cooled, a crust formed, and oceans condensed upon it. 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.

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