Three supermassive black holes closely orbiting around each other have been discovered in a galaxy more than 4 billion light years away from Earth. This is the tightest trio of black holes known to date and is remarkable since most galaxies have just one at their center (usually with a mass between 1 million to 10 billion times that of the Sun). The discovery suggests that these closely packed supermassive black holes are far more common than previously ...
via Medindia Health News
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