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Veiled black holes

Lurking at the centers of many galaxies, supermassive black holes make their presence known by gobbling gas, which heats up to fuel quasars and other fireworks. These so-called active galactic nuclei (AGN) are among the most luminous objects in the universe. Now astronomers say that they've found a new, relatively common class of AGN, so heavily smothered by gas and dust that virtually none of the visible and ultraviolet light generated within them can get out.

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