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Black Holes - College Essays

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 ...

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time slows down relative to that of distant observers, stopping
completely on the horizon. Once a body has contracted within its
Schwarzschild radius, it would theoretically collapse to a singularity—that
is, a dimensionless object of infinite density.

Formation

Black holes may form during the course of stellar evolution. As
nuclear fuels are exhausted in the core of a star, the pressure associated
with their heat is no longer available to resist contraction of the core to
ever higher densities. Two new types of pressure arise at densities a
million and a million billion times that of water, respectively, and a
compact white dwarf or a neutron star may form. If the core mass exceeds
about 1. 7 solar masses, however, neither electron nor neutron pressure is
sufficient to prevent collapse to a black hole.
Astronomers have discovered X-ray emissions from a binary star
system, Cygnus X-1, in which the primary is a normal star of about 30 solar
masses. Doppler ...

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PAPER DETAILS
Added: 8/18/2004 07:42:52 PM
Category: Science & Nature
Type: Premium Paper
Words: 688
Pages: 3

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