NGC 5139 (Omega Centauri) -- An image, links, data, & discussion from SEDS. Visit

Omega Centauri: Nucleus of a Milky Way Dwarf Spheroidal? -- A technical article from the Los Alamos E-print archive that discusses the possibility that Omega Centauri could be the remains (nucleus) of a once larger satellite dwarf galaxy that has been substantially reduced by tidal stripping caused by the Milky Way's disk. Visit