At the center of most galaxies are black holes so massive—up to several billion times the mass of our sun—that they have earned the descriptor “supermassive.” Compare this to your run-of-the-mill stellar-mass black hole, a measly 10 to 100 times our sun’s mass. Understanding these supermassive black holes will help astronomers understand the origin and evolution of galaxies. One open question is whether they can form binaries.
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Source: Phys.org