... Behemoth black hole found in an unlikely place . ... black holes . ... Chandra finds evidence for serial black hole eruptions . ... Astronomers have used NASA s Chandra X-ray Observatory to show that multiple eruptions from a supermassive black hole over 50 million years have rearranged the cosmic landscape at the center of a group of galaxies. Scientists discovered this history of black hole eruptions by studying the NGC 5813 Group, a group of galaxies about 105 million light-years from Earth. ...