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Ingredients for Big Black Holes Detected in Milky Way's Core

An artist's illustration of a newfound large star cluster near the center of the Milky Way that may be a breeding ground for intermediate black holes.

Amazing black holes detected

August 23, 2012

Two X-ray space observatories, NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) and the European Space Agency's XMM-Newton, have teamed up to measure definitively, for the first time, the spin rate of a black hole with a mass 2 million times that of our sun. (NASA)