Black holes are places where ordinary gravity gets so extreme that not even a beam of light can excape it. They are produce by massive stars as a natural part of the stellar evolutonary process. It can be produced by a dying star which is 20 times the mass of the sun
A person falling into a black hole would be pulled apart by intense tidal forces. The intense gravitational pull would be much stronger on someones feet in a black hole then their head. They would then be crushed into infinite density and sucked into the black hole.
There are three types of black holes: stellar, supermassive, and miniature.
A black hole is invisable because it is so compact that no light can escape. Only stars with a mass much larger than the sun have the ability to become a black hole.
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