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Black hole

A black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping it except through quantum tunnelling behaviour (known as Hawking Radiation).

The gravitational field is so strong that the escape velocity near it exceeds the speed of light.

This implies that nothing, not even light, can escape its gravity.

This makes this object invisible to the rest of the universe, hence the word "black".

Note:   The above text is excerpted from the Wikipedia article "Black hole", which has been released under the GNU Free Documentation License.
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