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NASA Spacecraft's Census Tallies Millions of Black Holes

5 Sep 2012, 01:10 UTC
NASA Spacecraft's Census Tallies Millions of Black Holes
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Black holes are common. But actually counting them is no easy task. Even the brightest can be hard to see. Of course, “bright black holes” is a bit of an oxymoron. But when supermassive black holes at the center of a galaxy feed, the material falling into them heats up, giving off a bright glow across the electromagnetic spectrum. [More]

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