in the constellation Ophiuchus
870 million to 2 billion times the mass of the Sun
Diameter roughly equal to the diameter of Uranus' or Neptune's orbit around the Sun
This image from Chandra X-Ray Observatory shows the two black-hole nuclei as white and blue blobs near the center. [NASA/CXC/S.Komossa et al.]
This document was last modified: March 6, 2013.