What is the definition of a planet?

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Hi all,

In the October 4 New York times, which you can get online at nytimes.com, there is an article in the science section on how to define what a planet is. I thought this article would be of interest to all you astrologers. I am also wondering if there is an article by any astrologers on how they define a planet, for I am pretty sure that some astrologers such as Robert Zoller don't even use the outer planets in their interpretations of charts. I have even decided to throw the outer planets out for the time being, for the keywords for the outer planets sound the same as the keywords for the inner planets. Can anyone recommend an article that discusses this theme?
Thanks, Peter