The Pluto Revolt: Leading Astronomers Want the Plutoid to be Reinstated as a Planet

By Ian O'Neill August 10, 2008
The Pluto Revolt: Leading Astronomers Want the Plutoid to be Reinstated as a Planet

  • It is in orbit around the Sun.

  • It has sufficient mass so that it assumes a hydrostatic equilibrium (nearly round) shape.

  • It has "cleared the neighbourhood" around its orbit.

    • Ian O'Neill