Astronomy Picture of the Day . ... 4.10.1996 . ... Credit: UIT , NASA Explanation: Does an old, red globular cluster have any hot, blue stars? The rightmost picture, taken by the Ultraviolet Imaging Telescope in ultraviolet light, shows that indeed it does. Pictured , Omega Centauri is the largest known globular cluster in our Galaxy , containing well over a million stars. Many of these stars are evident in the visible light photograph on the left. ... October 1996 . ... 1995 1996 . ...