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Black hole
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What is a black hole?
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Once a giant star dies and the concentrated mass that is left becomes a 'black hole'.
They are hard to detect because they are completely black and do not reflect light.
Because of the intense mass, a black hole has a hugely powerful gravitational pull and anything passing in range of the gravity field will be sucked into the black hole - even light.
But anything at a safe distance will not be sucked in. Planets far enough away would merely circle the black hole like the planets circle round the Sun.
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