near the Andromeda galaxy (M31)
14,000 to 23,000 times the mass of the Sun
52,000-86,000 miles (84,000-138,000 km), roughly equivalent to the diameter of Jupiter
A Hubble Space Telescope view of the star cluster G1, which orbits the center of the Andromeda galaxy. The bright stars above the cluster are foreground stars inside the Milky Way galaxy. [NASA/M. Rich (UCLA)]
This document was last modified: January 19, 2006.