Omega Centauri

NGC 5139 (Omega Centauri) is a globular cluster in the constellation of Centaurus. Located at a distance of 17,090 light-years from Earth, it is the largest-known globular cluster in the Milky Way at a diameter of roughly 150 light-years. It is estimated to contain approximately 10 million stars, and a total mass equal to 4 million solar masses, making it the most massive-known globular cluster in the Milky Way.