The largest type of black hole is a supermassive black hole. In 2008, astronomers discovered a black hole with a mass of 18 billion Suns! It is 3.5 billion light years away and central tothe OJ287 Quasar. Scientists have been able to accurately mass the black hole because the Quasar contains a pair, allowing calculation of mass using period of orbit and radiation from the pair’s regular collisions. Other black holes have been estimated to be as massive, but none have had a mass computed nearly as accurately.
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