Pluto Facts: Space And Planets

Discovered in 1930, Pluto is the second closest dwarf planet to the Sun and was at one point classified as the ninth planet. Pluto is the largest dwarf planet but only the second most massive, with Eris being the most massive.


  • An 11-year-old girl gave Pluto its name.
  • Pluto takes 248 years to orbit the Sun.
  • Our moon is bigger than Pluto and 1/4 the diameter of Earth.
  • Russia is bigger than Pluto.
  • Pluto, Mickey Mouse's dog, was named after the planet, not the other way around.

  • Pluto never made a full revolution around the sun while it was still considered a planet.
  • Pluto has ice made out of water and a blue sky.
  • Pluto was discovered by a young research assistant in 1930.
  • Pluto has a heart shape on its surface.

  • Pluto was demoted to dwarf planet status not because it was too small, but because it's not unique among a mass of objects that orbit the sun beyond Neptune.
  • On Earth, the only ice is frozen water. On Pluto, nitrogen, methane and carbon monoxide also freeze solid.