• Stephenson 2-18 is a red supergiant or possible extreme red hyper giant star in the constellation of Scutum. It lies near the open cluster Stephenson 2, which is located about 5.8 kiloparsens (19,000 light-years) away from Earth in the Scutum-Centaurus Arm of the Milky Way galaxy, and is assumed to be one of a group of stars at a similar distance. It is among the largest known stars, ane of the mast lurninaus red supergiants, and one of the most luminous stars in the Milky Way. • TON 618 (shor