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"
Millions of Stars in Omega Centauri
16/04/2002
Pictured above is the largest ball of stars in our Galaxy. About 10 million stars orbit the center of this globular cluster - named Omega Centauri - as this giant globular cluster orbits our Galactic center. Recent evidence indicates that Omega Centauri is by far the most massive of the about 150 known globular clusters in the Milky Way. Omega Centauri, cataloged as NGC 5139, spans about 150 light years across, lies about 15,000 light years away, and can be seen without visual aid toward the constellation of Centaurus. The stars in globular clusters are generally older, redder and less massive than our Sun. Studying globular clusters tells us not only about the history of our Galaxy but also limits the age of the universe.