A black hole is a celestial object of such intense gravity that it attracts everything near
it and then prevents everything, including light, from ever escaping.
Black holes are even fainter than neutron stars, so signs of
a black hole must be looked for, rather than its actual presence. If a black hole is
located in a binary system, there is a good chance of detecting it, since the black hole
will attract material from its companion star. The matter will swirl around the black
hole before it enters, and heat up until it gives off x-rays. So, x-ray sources must be
studied in order to see if a black hole is present. If the sources have too much mass to be
neutron stars, then it is concluded that the object is a black hole.
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