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Science Bulletins: Black Holes in a Rare Ring

NASA's Chandra X-ray Observatory recently spied a spectacular cosmic sight: a ring of eight black holes. Telescopes that view the Universe in optical, ultraviolet, and infrared light can see the galaxy where the ring resides, but only an X-ray telescope can detect the black holes lurking within. Scientists believe the ring was formed in a galactic collision millions of years ago.
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