NASA Universe
@NASAUniverse
Your backstage pass to the universe and how NASA studies it. Exoplanets, black holes, dark energy, and more!
加入 March 2009
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While our Swift satellite was designed to study faraway cosmic explosions, it has also observes nearby icy comets! These rocky snowballs are leftover from the solar system’s formation, and Swift watched one’s spin slow down: #CollectRocksDay#
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