Eric Walker added Type II supernovae to SUPERNOVA ALERT: SN 2023ixf has just been discovered in the Pinwheel Galaxy, M101! At 21 million light years this is the closest SN in a decade, and should become bright enough for amateur telescopes!!!

Eric Walker added Type II supernova - Wikipedia to Type II supernovae

Eric Walker added SN 1987A and Type II supernova - Wikipedia to Type II supernovae, and added Type II supernovae to Supernovae

Eric Walker added A Star Went Supernova in 1987. Where Is It Now? - The New York Times to SN 1987A, and added SN 1987A to Type II supernovae and Large Magellanic Cloud

Eric Walker added SN2016iet, Pair-instability supernovae and Type II supernovae and a number of links to Supernovae, and added Supernovae to Stars