These images of the Arches cluster, taken by three different telescopes, reveal progressively more detail in the tightly packed collection of about 2,000 stars. The Arches is the densest star cluster in our Milky Way Galaxy and resides in our galaxy's crowded core.

Credit: NASA, ESA, D. Figer (STScI); [Middle] - G. Serabyn (JPL), D. Shupe (Caltech) and D. Figer (STScI); [Right] - NASA, ESA and D. Figer (STScI)