Re: Pluto is a dwarf planet

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Re: Pluto is a dwarf planet
by Rubén Moreno Montolíu on Sunday 27/Jan/2008, @15:50

There is a standard definition of a planet:

(1) 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.
(2) 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.
(3) All other objects orbiting the Sun shall be referred to collectively as “Small Solar System Bodies”.

More info: http://www.answers.com/planet&r=67

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