Omega Centauri has a center dense with stars. Scientists call this a globular star cluster and believe it contains several million stars. Most are yellow-white dwarf stars like our Sun. The stars here are very old. Some date back 12 billion years! Omega Centauri is the biggest and brightest globular star cluster in the Milky Way and is about 17,000 light-years from Earth. You can see it with the naked eye on a dark night as a small cloud in the southern sky.