Omega Centauri
Omega Centauri (ω Cen or NGC 5139) is a globular cluster in the constellation of Centaurus. It is 15,800 light-years (4,850 pc) away, and is the largest globular cluster in the Milky Way. Its diameter is about 150 light-years. It contains about 10 million stars with a total mass equivalent to 4 million solar masses.