NGC 6946, also known as the Fireworks galaxy, Arp 29, and Caldwell 12, is a spiral galaxy in the constellation of Cepheus and Cygnus. It is about 22.5 million light-years away from Earth. It was discovered by William Herschel in September 9, 1798. It's highly obscured by interestellar matter, and it's very close to the galactic plane. It has a third of the Milky Way’s size.