This galaxy cluster 7.7 billion light years away was discovered in data from the WISE Mission All Sky Survey. The discovery image is shown in the main panel. The inset shows a deeper optical and near-infrared composite image constructed using data form the WIYN telescope at Kitt Peak in Arizona and Subaru Telescope in Hawaii. The red galaxies in this image are part of the cluster, and the circles in this inset highlight the galaxies seen in WISE that were used to detect the cluster. This galaxy cluster is the first of thousands that are expected to be discovered with WISE over the entire sky.

Image credit: NASA/JPL-Caltech