A pair of supermassive black holes, known as a binary black hole system, emitted a flare that is brighter than a trillion stars. The duo is located in galaxy OJ287 and are so close together they appear as one dot in the night sky.

Galaxy OJ287 lies in the direction of the constellation Cancer at approximately 5 billion light-years from

Source: Hot Hardware – Astronomers In Awe As Black Holes Emit A Flare Of Light Brighter Than A Trillion Suns