@paulfuhlir Read the article please, then argue. http://nyti.ms/1yF44Z5
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@paulfuhlir Why Pluto and Ceres then? Because they're round?
@paulfuhlir Stars can orbit other stars. Why not planets? (Parroting Alan Stern.) If Moon were same size as Earth, what would you call it?
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@paulfuhlir Why should definition be limited to our solar system? Now 1,000 planets known around other stars.
End of conversation
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