A Middleweight Black Hole is Hiding at the Center of a Giant Star Cluster

ENN
Feb 8, 2017, 1:28 pm117 pts
All known black holes fall into two categories: small, stellar-mass black holes weighing a few Suns, and supermassive black holes weighing millions or billions of Suns. Astronomers expect that intermediate-mass black holes weighing 100 - 10,000 Suns also exist, but so far no conclusive proof of such…

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