A bright type-Ia supernova SN 2014J is discovered in the starburst galaxy Messier 82.
A photograph from the Hubble Space Telescope reveals a companion star that survived the explosion of a supernova in galaxy NGC 7424. This brings strong evidence to a theory according to which Type IIb "stripped-envelope" supernovae are due to stellar companions capturing hydrogen from the progenitor star's envelope before its explosion.
Pan-STARRS project releases its first astronomical catalog, consists of 2 petabytes of data collected over four years. An astronomer from collaborating institution also discloses that his group has studied new types of supernova explosions and the disruptions of stars by supermassive black holes from data of this Massive Digital Sky.
Space telescope observations indicate that the supernova RCW 86, first seen by Chinese astronomers in 185 AD, expanded at an unprecedented rate due to the formation of a vacuum-like "cavity" around it in the early stages of the death of its star. The supernova's rapid expansion had previously been one of astronomy's most enduring mysteries.