A black hole is a point of extreme mass in space-time with a
radius, or event horizon, inside of which all electromagnetic
radiation (including light) is trapped by gravity. A black hole is
an extremely compact object, collapsed by gravity which has
overcome electric and nuclear forces. It is believed that stars
appreciably larger than the Sun, once they have exhausted all their
nuclear fuel, collapse to form black holes: they are "black"
because no light escapes their intense gravity. Material attracted
to a black hole, though, gains enormous energy and can radiate part
of it before being swallowed up. Some astronomers believe that
enormously massive black holes exist in the centre of our galaxy
and of other galaxies. This book brings together leading research
from throughout the world.
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