"Galaxy Supernova" is the eighth Japanese single by South Korean girl group Girls' Generation. It was included on the group's third Japanese studio album Love & Peace and was released as the second single from the album on September 18, 2013. The song was written by Frederik Tao Nordsø Schjoldan, Fridolin Nordsø Schjoldan, Kamikaoru, and Martin Hoberg Hedegaard, whilst production was handled by Nozomu Tsuchiya. Musically, "Galaxy Supernova" is an electropop song. The song received generally favorable reviews from music critics, who praised its music styles and compared the song to the group's previous Japanese singles "Mr. Taxi" and "Paparazzi". The song peaked at number three on the Japanese Oricon Singles Chart and number four on the Japan Hot 100. A music video for the track was released on September 5, 2013. To promote the song, Girls' Generation performed live on music shows Secret Live and Live Monster in Japan.