NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) helps...
Mar 4, 2013 | Posted by: roboblogger | Full story: Clarksville Online
Two X-ray space observatories, NASA's Nuclear Spectroscopic Telescope Array 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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