Also Supermassive Black Hole
Black hole formation begins when a massive star dies and its core ends up collapsing in on itself. If the mass of the body is sufficiently large so that the escape velocity is greater than that of light itself then nothing, not even light can escape and a black hole is formed. A black hole is genuinely "black" and can only be detected through the observation of the effects that its gravitational force has on other nearby masses.
It is not known what happens to the matter that is sucked in to a black hole, the exact processes at work are not yet fully understood. Some theorists have suggested that anything falling in to a back hole will be expelled in to another universe or to another dimension, some have also speculated that two black holes could be joined to form a wormhole in space.
Related entries: Asteroid
, Big Bang
, Face on Mars
, Supermassive Black Hole
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