What are black holes?

A black hole is a region of spacetime where gravity is so strong that nothing, not even light, can escape its pull.

Black holes are formed when a large mass, such as a star, collapses in on itself from its own gravity.

They can be extremely small, such as the size of an atom, or large enough to contain multiple solar systems.

Black holes are classified by their mass, with supermassive black holes containing millions to billions of times the mass of our Sun.

Examples of supermassive black holes include the one at the center of our own Milky Way Galaxy and the one at the center of the supergiant elliptical galaxy M87.

Intermediate-mass black holes contain between 100 and 100,000 times the mass of our Sun.

Stellar-mass black holes contain between 3 and 30 times the mass of our Sun.

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