Omega () Centauri (NGC 5139) is the brightest, largest and most spectacular globular star cluster, a showpiece object of the southern sky. This image was captured from San Antonio de Areco, Buenos Aires, Argentina by astrophotographer Ignacio Diaz Bobillo using an AP130GT telescope, Losmandy G11 mount, Canon 6D, Baader modified and peltier-cooled camera, 865mm f6.5 lens, ISO800, 22 x 180-second exposures. Image credit: Ignacio Diaz Bobillo.