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What is a black hole?

What is a black hole? Here are some definitions.

Noun
  1. A gravitationally domineering celestial body with an event horizon from which even light cannot escape; the most dense material in the universe, condensed into a singularity, usually formed by a collapsing massive star.
  2. (figuratively) A void into which things disappear and/or from which nothing emerges.
    1. A sphere of influence into which or from which communication or similar activity is precluded.
    2. An entity which consumes time or resources without demonstrable utility.
  3. A dungeon or dark cell in a prison; a military lock-up or guardroom.
  4. (Internet) Alternative spelling of blackhole
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You wouldn't be able to tell by looking whether the black hole was originally formed by matter, antimatter or green cheese.
At some point after its formation, the black hole emits a flare of superheated gases, travelling at relativistic speeds.
Gas and dust funnel towards a black hole in an accretion disk, swirling around and into the void like water down a drain.
These stars are whipping around the black hole in much the same way as planets in our Solar System are revolving around the Sun.
It was a lonely walk, deep into an abyss that beckoned like a black hole, a fallen star.
Imploding his linear narrative in a single frame, Shaw creates on canvas a kind of literary black hole.

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