NuSTAR, the specialized space telescope by NASA designed to study black holes discovered a luminous Pulsar. After measuring the dead star's output, they found it was outputting as much energy as 10 million suns.
Hubble Frontier Field Abell This long-exposure Hubble Space Telescope image of massive galaxy cluster Abell 2744 (foreground) is the deepest ever made of any cluster of galaxies. It shows some of the faintest and youngest galaxies ever detected in space.
Clump of active galactic cores that stretch 4 billion light-years from end to end. The structure is a light quasar group (LQG), a collection of extremely luminous Galactic Nulcei powered by supermassive central black holes.