Quote:
Originally posted by Mojo:
I think there was something about this years ago, about there being a tenth planet and them naming it...Planet X (seriously)
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There have been suggestions about a tenth planet from the early 80s. Mayble late 70s. There are eccentricities in uranus orbit that led us to discover neptune, eccentricities in neptunes orbit that led us to discover pluto, and eccentricities in all three that dont quite add up.
The name "Planet X" originates from then and comes from the roman numeral for 10, X.
In science fiction planet 10 is commonly called "Persephone". Or at least its called that in a couple of books I have lying around.
Hitchhiker guide to the galaxy calls it "Rupert" though.