NGC 772 (also known as Arp 78) is an unbarred
spiral galaxy approximately 130 million light-years away in the
constellation Aries. It is notable for possessing a single
elongated outer spiral arm, which has likely arisen due to tidal
interactions with nearby galaxies. At around 100,000 light years
in diameter, NGC 772 rivals the Milky Way Galaxy in size and is
surrounded by several satellite galaxies including the dwarf
elliptical, NGC 770.