UY Scuti is the largest star ever discovered. It is located in the Milky Way galaxy. Its diameter is about 2,377,536,000 km, and has a solar radius of 1,708 times as our sun. Its expanding mass cloud reach beyond into the orbit of Jupiter. Its whole mass will be about 15.9 AU=Astronomical Units across. UY Scuti's distance is around 9500 light years from Earth.