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
This gamma-ray image from the Integral satellite shows Cygnus X-1 (the large white blob at center) and Cygnus X-3, which is an accretion disk encircling a neutron star. [ESA]
This document was last modified: November 7, 2005.