How the binary system formed is a mystery
Astronomers have discovered the nearest known black hole to Earth, and it’s twice as close as the previous record holder.
Black holes start out as large stars with a mass roughly five to 10 times that of the sun. As larger stars approach the ends of their lives, they fuse heavier and heavier elements, such as silicon or magnesium, inside their burning cores. But once this fusion process begins forming iron, the star is locked on a path to violent self-destruction.
But not all black holes are feeding, and finding these dormant monsters among the roughly 100 million stellar-mass black holes estimated to be lurking in the Milky Way requires an elaborate strategy.
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