Hawking radiation is black-body radiation that is predicted to be released by black holes, due to quantum effects near the event horizon. This radiation reduces the mass and energy of black holes, causing them to shrink and ultimately vanish. If black holes evaporate via Hawking radiation, a non-rotating and uncharged stupendously large black hole with a mass of 1 × 10 M ☉ will evaporate in around 2.1 × 10 years. Black holes formed during the predicted collapse of superclusters of galaxies in the far future with 1 × 10 M ☉ would evaporate over a timescale of up to 2.1 × 10 years.