Deep in the universe, there is a mysterious and powerful celestial body, the black hole. A black hole is like a cosmic vortex, with a strong gravitational force that can swallow up everything close to it, even light cannot escape.
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That's got to be an artist impression, though. My current understanding is that a "black hole" is essentially an extremely massive ring rotating at nearly the speed of light - and no, no getting sucked into other dimensions or through a wormhole...
I thought so too until not long ago, but it is actually very unlikely that an astronomical body forms with zero angular momentum (zero probability in fact). The Schwarzschild metric of a non-rotating black hole is the simplified case. More realistic is the so-called Kerr metric.
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(Reality doesn't have singularities of course only mathematical models of it do.)