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
An artist's concept of Cygnus X-1 shows hot gas from the giant blue star flowing toward the black hole, forming a bright accretion disk. [ESA/Hubble European Space Agency Information Centre (M. Kornmesser, L. L. Christensen)]
This document was last modified: February 11, 2007.