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Plenty of black holes do-si-do

Team finds 33 merging galaxies with 'waltzing' black-hole pairs

WASHINGTON — The universe is one big dance party for black holes. New observations from the W.M. Keck Observatory in Hawaii and the Hubble Space Telescope found 33 merged galaxies in which pairs of supermassive black holes are “waltzing” around the galactic centers.

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