an image of a very large star cluster

Hubble-Spitzer Color Mosaic of the Galactic Center Caption This composite color infrared image of the center of our Milky Way galaxy reveals a new population of massive stars and new details in complex structures in the hot ionized gas swirling around the central 300 light-years. Credits Hubble image: NASA, ESA, and Q.D. Wang (University of Massachusetts, Amherst); Spitzer image: NASA, Jet Propulsion Laboratory, and S. Stolovy (Spitzer Science Center/Caltech)