HD 209458 b, Osiris
EXOPLANET · the evaporating planet
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A planet caught in the act of evaporating. Osiris orbits so close to its star that its atmosphere boils off into space, streaming behind it like a comet's tail. It earned a stack of firsts: the first planet seen crossing its star, and the first with water vapor detected in its air. It will survive for billions of years yet, shrinking all the while.
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