Cygnus OB2 is a star cluster in the Milky Way that contains many hot, massive young stars. This composite image of Cygnus OB2 contains X-rays from Chandra (blue), infrared data from Spitzer (red), and optical data from the Isaac Newton Telescope (orange). Astronomers would like to better understand how this and other star factories like it form and evolve. (Read more) | image: NASA/CXC/SAO