The composite image at left, taken in visible and near-infrared light, reveals the location of five tiny galaxies clustered together 13.1 billion light-years away. The circles pinpoint the galaxies. The close-up images at right, taken in near-infrared light, show the puny galaxies. The letters "a" through "e" correspond to the galaxies' location in the wide-field view at left. Simulations show that the galaxies will eventually merge and form the brightest central galaxy in the cluster, a giant elliptical similar to the Virgo cluster's M87.
Credit: NASA/ESA/M. Trenti (Univ. of Colorado, Boulder, and Institute of Astronomy, Univ. of Cambridge, UK)/L. Bradley (STScI)/the BoRG team