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⁾