Jeg vil melde om at IAU har endelig bestemt seg for en definisjon av en planet, og etter denne definisjonen har solsystemet 8 planeter. Pluto har blitt definert som en "Dwarf-planet". Definisjonen er som følger:
-A "planet" is a celestial body that: (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.
-A "dwarf planet" is a celestial body that: (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite.
-All other objects orbiting the Sun shall be referred to collectively as "Small Solar System Bodies".
(definisjonen er hentet fra Wikipedia)
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