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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