After Pluto was discovered in 1930, it was the ninth planet of the solar system. It has five moons: Charon, Styx, Nix, Kerberos, and Hydra. In 2006 it was reclassified as a dwarf planet as other even larger objects are known in the Kuiper Belt, like the dwarf planet Eris. 1)
As is the case for most planets orbiting the Sun, Pluto was named after a Roman god — Pluto is the Roman god of the underworld. The name was proposed by an 11-year-old girl, Venetia Burney (1918–2009). 2)
Pluto's orbit varies between 30 and 49 Astronomical Units (AU), or 4.4–7.4 billion km, from the Sun, with a period of 247.94 Earth years. This means that between its discovery and downgrade from the planet status, even not one-third of a Plutonian year passed. 3)