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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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B
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Black_hole
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1992-09-03
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890b
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An object in space whose gravity is so
great that nothing can escape from it, not
even light. Thought to form when massive
stars shrink at the ends of their lives, a
black hole sucks in more matter, including
other stars, from the space around it. Matter
that falls into a black hole is squeezed to
infinite density at the centre of the hole.
Black holes can be detected because gas
falling towards them becomes so hot that it
emits X-rays. Satellites above the Earth's
atmosphere have detected X-rays from a number
of objects in our Galaxy that might be black
holes. Massive black holes containing the
mass of millions of stars are thought to lie
at the centres of quasars. Microscopic black
holes may have been formed in the chaotic
conditions of the Big Bang. The English
physicist Stephen Hawking has shown that such
tiny black holes could `evaporate' and
explode in a flash of energy.