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Black Holes Encyclopedia
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FAQ

How does a black hole form?

A black hole forms when any object reaches a certain critical density, and its gravity causes it to collapse to an almost infinitely small pinpoint. Stellar-mass black holes form when a massive star can no longer produce energy in its core. With the radiation from its nuclear reactions to keep the star "puffed up," gravity causes the core to collapse. The star's outer layers may blast away into space, or they may fall into the black hole to make it heavier. Astronomers aren't certain how supermassive black holes form. They may form from the collapse of large clouds of gas, or from the mergers of many smaller black holes, or a combination of events.

Other FAQs

What is a black hole?

Do black holes really exist?

Are any black holes close to Earth?

Will our Sun become a black hole?

What is the biggest black hole?

What happens when you get close to a black hole?

Are black holes 'doorways' to other parts of the universe?

Can anything ever escape from a black hole?

How many black holes are there?

How can a black hole's own gravity, but not light, escape from it?

Where did the name 'black hole' come from?

How are black holes named?

Will our universe become a black hole?

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