The universe may be full of ex-moons flung from their home worlds


Getty By John Wenz The cosmos may be awash in wandering, lonesome former moons, ejected from their respective planetary systems long ago. Nobody has ever conclusively seen a moon orbiting a planet in another stellar system, partly because their small size and great distance makes them difficult to find with modern detection methods. But it’s also possible that there just aren’t very many of them. Yu-Cian Hong at Cornell University in Ithaca, New York,
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