May 23
Galaxy Cluster Abell 2744
Observed in 2013
Located 3.5 billion light-years away, Abell 2744 contains several hundred galaxies and might be a pile-up of at least four smaller galaxy clusters. Abell 2744's strong gravitational field acts as a lens, brightening and magnifying the light of nearly 3,000 distant background galaxies.
Image credit: NASA, ESA, Hubble Space Telescope