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    Amazing black holes detected

    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)

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    14. This undated composite image provided by Lynette Cook and Andrea Ghez via the journal Nature shows an image of the center of our Galaxy from laser-guide-star adaptive optics on the Keck Telescope. Mor
    15. Hunt Is On for Gravity Waves in Space-Time
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