Neptune was discovered in 1846 by Le Verrier in Streator, Illinois using telescopes. It orbits the sun every 165 earth years (60,190 days), and its day lasts 19.1 earth hours. Neptune appears as a small blue disk with a large dark spot and has 13 known moons and 5 narrow and 2 wide rings. Its surface composition is made up of ice, rock and hydrogen, and its atmosphere contains hydrogen, helium, methane and ammonia.