plutoOn this date in 1930, astronomer Clyde W. Tombaugh discovered Pluto. At the time of its discovery, Pluto was considered the ninth planet in the solar system. However, on Aug. 24, 2006, the International Astronomical Union changed the definition of a planet and downgraded Pluto to dwarf planet status.

Did you know?:

  • Pluto’s surface temperature is 44 degrees Kelvin or about negative 360 degrees Fahrenheit.
  • It takes about 248 years for Pluto to make one orbit around the sun.
  • Pluto has three moons: Charon [the largest], Nix and Hydra.