A Brief Definition of a Black Hole
When an enormous
amount of mass is concentrated in a small region of
space, spacetime
becomes so highly curved that, in essence, it forms
an inescapable trap, or black hole. Once something enters
a black hole, it can never get back out. The name black
hole emphasizes that even light cannot escape. A beam of
light, when directed outward from inside a black hole, would
rise and fall in an arc like a shoot of water from a fountain.
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