Omega Centauri is a vast “globular cluster”, a tightly grouped bunch of stars. 15,800 light years away and 150 light years across, Omega Centauri is the size of the full Moon in our night sky and can be seen in rural areas on clear nights. Containing 4 million solar masses, Omega Centauri is the largest, brightest, and most massive known globular cluster in the Milky Way. Some astronomers hypothesize that Omega Centauri is the remnant of a dwarf galaxy that merged with the Milky Way.
Keishinrei 