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Kerr Black Hole |

Kerr Black Hole

Context

∙ Rotating black holes (a.k.a. Kerr black holes) have a unique feature: a region outside their outer event horizon called the ergosphere. 

What is a Black Hole?

∙ A black hole is an extremely dense object whose gravity is so strong that nothing, not even light, can escape it.

∙ A black hole does not have a surface, like a planet or star. Instead, it is a region of space where matter has collapsed in on itself.

∙ This catastrophic collapse results in a huge amount of mass being concentrated in an incredibly small area.

∙ Formation: A black hole is formed when a really massive star runs out of fuel to fuse, blows up, leaving its core to implode under its weight to form a black hole.

∙ The centre of a black hole is a gravitational singularity, a point where the general theory of relativity breaks down, i.e. where its predictions don’t apply. 

∙ A black hole’s great gravitational pull emerges as if from the singularity. 

Rotating Black Hole

∙ A rotating black hole is also called a Kerr black hole. 

∙ There are two event horizons, the outer and the inner. 

Kerr Black Hole |

∙ The region of space in-between the two horizons is the ergosphere.

∙ Anything inside the ergosphere will be dragged by the black hole and rotate with it but it can still escape. 

∙ However, anything inside the inner event horizon can never escape.

∙ Scientific Significance: We can extract rotational energy from a rotating black hole.

∙ If something is sent inside of the ergosphere, and split it up into two parts, one goes in the black hole while the other comes out. 

∙ The part coming out can be made to have a much higher speed, hence higher energy. 

Kerr Black Hole |
Do You Know?– Known black holes fall into two classes: a. Stellar mass: 5 to tens of times the Sun’s mass; b. Supermassive: 100,000 to billions of times the Sun’s mass;c. Middleweight black holes may exist between these classes, but none have been found to date.– Spaghettification: As objects approach the event horizon of a black hole, they’re horizontally compressed and vertically stretched, like a noodle.– Sagittarius A*: Sagittarius A* is more than 25,000 light years from Earth –  nearest supermassive black hole, with an estimated mass millions of times that of Sun. a. Often abbreviated by researchers to Sgr A* (pronounced “Sagittarius A star”), it sits in the constellation of Sagittarius at the heart of the Milky Way.
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