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Black Hole

gravitational field, electromagnetic radiation, Black Hole, vicinity, horizon

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Black Hole, an extremely dense celestial body that has been theorized to exist in the universe. The gravitational field of a black hole is so strong that, if the body is large enough, nothing, including electromagnetic radiation, can escape from its vicinity. The body is surrounded by a spherical boundary, called a horizon, through which light can enter but not escape; it therefore appears totally black.

Contributors

Pasachoff, Jay. M.m A.B., A.M., Ph.D.

Field Memorial Professor of Astromony and Director of the Hopkins Observatory, Williams College. Author of "Astronomy: From the Earth to the Universe, 6th ed."; "Field Guide to the Stars and Planets, 4th ed."; "Fire in the Sky"; and "Nearest Star: The Exciting Science of Our Sun".



Article key phrases:

gravitational field, electromagnetic radiation, Black Hole, vicinity, horizon, universe, light

 
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