Omega Centauri
Omega Centauri, also known as NGC 5139, is the largest and brightest globular cluster in the Milky Way, containing about 10 million stars. It is located approximately 15,800 light-years away in the constellation Centaurus.
Source: noirlab.edu
APODs including "Omega Centauri"
M81: A Bulging Spiral Galaxy
13/07/1996
Few stars are still forming in the old giant spiral galaxy M81. The blue regions in this picture - representing ultraviolet light - highlight regions of bright young stars and star formation and appear rare than in M74 and M33. The red regions - representing the visible light - show a large population of older, less massive stars. M81 is therefore classified as spiral galaxy type "Sab" on the Hubble Sequence of Galaxies. One distinguishing feature of these types of galaxies is the relatively large central bulge surrounding the center of the galaxy. A massive density wave circulates around the center of spiral galaxies. It is not well understood why the bulge of M81 glows as bright as it does in ultraviolet light. Speculation includes that this may be due to hot evolved stars such as those found in the ancient globular cluster Omega Centauri.