This plot shows the mass distribution from weak-lensing measurements (contours) and red-sequence galaxies (black dots) of the galaxy cluster RXC J2248.7-4431 at redshift z=0.348. It is evident that galaxies and mass distribution are in good agreement over distances of several million light years (2 Mpc, or 2 Megaparsecs, is roughly 7 million light years). This was an anticipated result and welcome validation of the potential for gravitational lensing analysis with the Dark Energy Survey. The red-sequence galaxy distribution extends substantially farther out (about 15 Mpc), reaching a total length of approximately 1 degree, or twice the diameter of the full moon.