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Black hole is an object with sufficient density that the force of gravity prevents anything from escaping from it except through quantum tunneling behavior.

Google define it as a region of spacetime where gravity is so strong that nothing no particles or even electromagnetic radiation

If the black hole hit the earth it would puncture our planet's surface like a hot knife through butter, but it would immediately begin to slow down because of its gravitational interaction with Earth.

If one goes to the black hole the person will ultimately going to get torn apart by the extreme gravity. No material, especially fleshy human bodies, could survive intact. So once you pass beyond the edge of the event horizon, you're done. There's no getting out.

There are four types of black holes: stellar, intermediate, supermassive, and miniature. The most commonly known way a black hole forms is by stellar death. As stars reach the ends of their lives, most will inflate, lose mass, and then cool to form white dwarfs
but NASA recored that there are just three main blackholes

Judging from the number of stars large enough to produce such black holes, however, scientists estimate that there are as many as ten million to a billion such black holes in the Milky Way alone