The International Astronomical Union named Pluto's fourth and fifth moons Kerberos and Styx.
Pluto Loses its Status as a Planet.
Two newly discovered moons orbiting Pluto were named Nix and Hydra.
The solar system's largest known dwarf planet is discovered.
The Hubble Space Telescope captured the first images of the surface of Pluto.
United States Naval Observatory astronomer James Christy discovered Pluto's largest moon.
Pluto was officially named.
American astronomer Clyde Tombaugh discovered Pluto.
