Eric Walker added A Star Went Supernova in 1987. Where Is It Now? - The New York Times to Neutrinos, SN 1987A and Atacama Large Millimeter/submillimeter Array (ALMA)

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 SN 1987A to Large Magellanic Cloud, and added Large Magellanic Cloud to Galaxies