Sao (moon)

"Sao" refers to a natural satellite, or moon, that orbits the planet Neptune. It is one of the many irregular moons of Neptune and is part of a group known as the "Nereid group." Discovered in 1989 during the Voyager 2 spacecraft flyby, Sao is relatively small and is thought to be composed of icy and rocky material. It has an irregular shape and a diameter of about 20 kilometers (12 miles).