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It is thought that similar but even larger black holes, with masses of about a hundred million times the mass of the sun, occur at the centers of quasars. For example, observations with the Hubble telescope of the galaxy known as M87 reveal that it contains a disk of gas 130 light-years across rotating about a central object two thousand million times the mass of the sun. This can only be a black hole.
— A Brief History of Time
 (book)
by Stephen Hawking
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| Language: | English |
| Submitted by: | spondulix |
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