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Black Hole Mysteries
About Galaxies Cosmic Crack-Up Monster Black Holes Space/Time: Galaxies
What is a black hole?
A black hole is an object so massive and dense that nothing—not even light—can escape from its powerful gravitational field.

How are black holes formed?
Smaller black holes (about 10 times as massive as the Sun) are created in supernova explosions, when the core of a dying star suddenly collapses. Supermassive black holes hundreds of millions of times as massive as the Sun are found at the centers of galaxies. Theories about the formation of supermassive black holes vary, but they probably grow so large by feeding on the mass that accumulates at galactic centers.

What happens inside a black hole?
The science of physics is not yet advanced enough to know for sure what happens inside a black hole.


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