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When was the first piece of evidence found that ultimately led astronomers to suggest that the giant ...

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When was the first piece of evidence found that ultimately led astronomers to suggest that the giant ...

When was the first piece of evidence found that ultimately led astronomers to suggest that the giant elliptical galaxy M87 has a supermassive black hole in its center, and what was the evidence?

(a)   1918, a jet of material from the center of the galaxy
(b)   1956, strong radio emission from two lobes of material, one on each side of the galaxy
(c)   1994, observation by the Hubble Space Telescope of dense clustering of stars around a compact central object

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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