Frontier Fields Galaxy Cluster Abell 370

The Hubble Space Telescope has some amazing superpowers, specifically when it comes to observing galaxies across time and space. One example is galaxy cluster Abell 370, which contains a vast assortment of several hundred galaxies tied together by the mutual pull of gravity. Photographed in a combination of visible and near-infrared light, this immense cluster is a rich mix of galaxy shapes. Entangled among the galaxies are mysterious-looking arcs of blue light. These are actually magnified and distorted images of remote galaxies behind the cluster. These far-flung galaxies are too faint for Hubble to see directly. Instead, the gravity of the cluster acts as a huge lens in space, magnifying and stretching images of background galaxies like a funhouse mirror.