M2 is one of the largest globular clusters associated with the Milky Way Galaxy. Its 150,000+ stars are among the oldest in the universe. It is about 37,000 light-years away in the constellation Aquarius.
More detail from the same image is shown below. These images are at the same scale as the images of globular clusters M5, M13, M15, M71, and M92.
132 minutes L and 120 minutes RGB binned 2x2 on 2014-08-28 using a QSI 583 from northern New Jersey through an Astro-Physics 155mm refractor at f7.1. North is up. ©2014