The A2104 galaxy cluster is emitting powerful X-Rays, seen here in blue, from several black holes.
In 2000, researchers at the Chandra X-ray Observatory discovered what they believe to be six black holes where they expected to see just one.
February 27, 2013 2:08 PM PST
Photo by: NASA/CXC/OCIW/P. Martini et al.
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