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That it exists is one of the few things on which researchers have been certain. What is it, really? How do we know that it's there? How do we ?°see?± it if it's ?°dark?±?
Some scientists think dark matter is in the form of massive objects, such as black holes, that hang out around galaxies unseen. Other scientists believe dark matter to be subatomic particles that rarely interact with ordinary matter.
In 1933, the astronomer Fritz Zwicky while studying the motions of distant galaxies in the Coma cluster estimated the total mass of a group of galaxies by measuring their brightness. When he used a different method to compute the mass of the same cluster of galaxies, he came up with a number that was 400 times his original estimate (13)...
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