Astronomers Find a Galaxy Containing Three Supermassive Black Holes at the Center
NGC 6240 is a puzzle to astronomers. For a long time, astronomers thought the galaxy is a result of a merger between two galaxies, and that merger is evident in the galaxy’s form: It has an unsettled appearance, with two nuclei and extensions and loops. NGC 6240 is about 400 million light years away, in …
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