For the first time, astronomers have managed to weigh a planet that is not bound to any star, a lonely world drifting through the Milky Way with no sun of its own. The measurement turns a ...

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Planets usually stay close to their host stars, tracing steady paths shaped by gravity. Yet some planets break free and drift alone through the Milky Way. Astronomers call these objects free-floating ...

Rogue planets — worlds that drift through space alone without a star — largely remain a mystery to scientists. Now, astronomers have for the first time confirmed the existence of one of these starless ...