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Essay Galaxy - Black Holes Black Holes

Black Hole, a theoretical concept in the study of gravitation. The gravitational field of a black hole, which is an extremely dense body, 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. Properties The black-hole concept was developed by the German astronomer Karl Schwarzschild in 1916 on the basis of Albert Einstein's theory of general relativity. The radius of the horizon of a Schwarzschild black hole depends only on the mass of the body, being 2. 95 km (1. 83 mi) times the mass of the body in solar units (the mass of the body divided by the mass of the sun). If a body is electrically charged or rotating,....

Number Of Pages: 3 Number Of Words: 702

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