UY Scuti, also known as UY Scuti, is a red supergiant located in the constellation of Scuti. The radius is approximately 1708 ± 192 times that of the Sun. Despite its large volume, its mass is only about 7-10 times that of the Sun,. The brightness of UY in the constellation of Shield is 340000 times that of the Sun, making it one of the most luminous stars. Stevenson 2-18 is a red supergiant located in the direction of the constellation of Shield. It is about 20000 light-years away from Earth and is located in the line of sight of the Stephenson open star cluster. The diameter of this star is about 2158 times that of the Sun, making it one of the largest known stars in terms of volume.