... X Ray Stars of 47 Tuc . ... CXC , NASA Explanation: Visible light images show the central region of globular cluster 47 Tuc anae is closely packed, with stars less than a tenth of a light-year apart. This Chandra false-color x-ray view of central 47 Tuc also shows the cluster is a popular neighborhood for x-ray stars , many of which are "normal" stars co-orbiting with extremely dense neutron stars -- stars with the mass of the Sun but the diameter of Manhattan Island. ...