Globular Cluster Messier 2 in Aquarius - Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets, Telescopes
739 Messier 2 is a globular cluster lying 55,000 light-years from Earth in the constellation Aquarius. It is a remarkable globular for several reasons. First, it is one of the largest known globulars with a diameter of 175,000 light-years. Second, it is a Shapley-Sawyer Class II globular, which means it has an extremely dense and bright core. How dense? Photometric measurements indicate that a 1'x1' area at its core contributes 37% of its light output. At 5' from the core, an equivalent area contributes only 0.02%. Lastly, it has interesting dark lanes arch...
Source: astronomy.com