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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If this “.” were a black hole, it would have about the mass of Jupiter’s moon Ganymede crammed into it! To become a black hole, it’s not about how much stuff an object has, but how much it’s been smooshed. That's a lot of gravity, period.
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