In the constellation Cygnus
6,000 to 10,000 light-years
15 times the mass of the Sun
Diameter 55 miles (90 km), equal to the size of a large American city
Data from orbiting X-ray observatories show how the gravitational field of the Cygnus X-1 black hole accelerates gas around it. [NASA/CXC/M.Weiss/SAO/J.Miller et al.]
This document was last modified: November 7, 2005.