A black hole is a region of space in which the gravitational field is so powerful that nothing, including electromagnetic radiation, can escape its pull after having fallen past its event horizon.
A black hole is a gravitional force that has a very strong density and sucks everything including light, nothing can escaped from its pull. Even it has pass through the event horizon except something that is travel faster than light.
A black hole is invisible, in bends off the light. It was so powerful that nothing could escape from it, including electromagnetic radiation. For example, a 13mm matter will be crushed into about 1.3 micrometer after sucked by black hole.
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