Hubble+Chandra+Keck image of MACSJ0717.5+3745, a collision of four galaxy clusters.
Credit: NASA, ESA, CXC, C. Ma, H. Ebeling, and E. Barrett (University of Hawaii/IfA), et al., and STScI.
Check behind the cut for the huuuuuuuge version.
So many galaxies.
So many stars.