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Physics - Black Holes

A Black Hole is an object in space whose gravity is so large not even light can escape it. This is why Black Holes are invisible.

There are two types of Black Holes:

Stellar mass black holes have the mass of a large star (about three to a hundred times bigger than the sun) and they result from the deaths of such stars.

Supermassive black holes, which are almost a million to a few million times bigger than the sun, exist at the centres of galaxies and may have come from the merger of many closely packed stars when the galaxies formed.

Inside a Black Hole

A black hole has three parts:

The event horizon, which is the perimeter of the black hole.

The singularity, or the heart of the hole formed from the ultimate compression of all matter within it.

Matter that falls from the event horizon toward the singularity.

The Event horizon

The event horizon is a spherical surface that defines the black hole. After an object enters the event horizon, it can never get out of the black hole or be visible to anyone on the outside. And nothing on the outside can be seen from the inside the horizon.

The Singularity and Falling Objects

Anything that falls inside the event horizon moves down toward the singularity. It merges into the singularity, which scientists believe is indefinitely dense.

Some mathematicians think that at the singularity there may be a wormhole, a passage from the black hole to another universe.

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