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Re: [Phys-l] Arbitrariness of definitions



On 10/18/09 14:26, Chuck Britton wrote:
Apropos history and Jupiter's moons - students might want to be
reminded that Ceres was counted as a planet for half a century or so
before being demoted, upon the discovery of the 'other' asteroids in
that vicinity.

And then there's Pluto......