Where did the supermassive ‘Mirach’s Ghost’ black hole come from?

 About 10 million light-years from Earth, a blurry galaxy named Mirach’s Ghost may help unravel a dark mystery:  where the largest black holes in the universe came from. But this ghostly galaxy has also deepened the mystery surrounding these objects’ births.

A black hole is a singularity, a region in space-time where matter has gotten too dense to sustain itself, and collapsed into a formless point. Supermassive black holes (SMBHs) are cosmic monsters, often weighing billions of times the mass of our sun, as compared to the mass of heavy stars that form ordinary black holes. They sit at the centers of large galaxies, sucking up gas and whipping stars around with their immense gravities. There’s one at the center of the Milky Way and an even larger one at the center of the Virgo A galaxy that astronomers have photographed. But it’s still not clear how these mammoth objects formed.

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