The placid appearance of NGC 4889 can fool the unsuspecting observer. But the elliptical galaxy harbours one of the most supermassive black holes ever discovered. Located ~300 million light-years away in the Coma Cluster, the giant elliptical galaxy NGC 4889, the brightest and largest galaxy in this image has a black hole that is 21 billion times the mass of the Sun. The event horizon has a diameter of ~130 billion kilometres. This is about 15X the diameter of Neptune’s orbit from the Sun...
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