Hundreds of dusty black holes found hiding in plain sight

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Astronomers detected 400 previously unknown black holes in a new X-ray survey of dusty galactic centers.

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Astronomers detected 400 previously unknown black holes in a new X-ray survey of dusty galactic centers.

If there are that many previously undetected black holes, could it be possible that "dark matter" may actually be the gravitational effect of many more undetected "black holes"?