NASA'S NuSTAR Helps Solve Riddle of Black Hole Spin

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NASA'S NuSTAR Helps Solve Riddle of Black Hole Spin
02/27/2013 12:00 AM EST

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.
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