投影仪焦距和屏幕大小 How does a black hole form?

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A black hole forms when any object reaches a certain critical density, and its grity 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," grity 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 heier. 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.

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What is a black hole?

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Basics

Black Holes: Stranger Than Fiction

What is a Black Hole?

Structure of a Black Hole

Birth of Stellar-Mass Black Holes: Grity's Victory

Seeing the Unseeable

Birth of Supermassive Black Holes: Battle in the Bulge

Fact vs. Fiction