Quote:
Originally Posted by HarryT
The problem with this approach is that we now know that Pluto is merely one (large) member of the "Kuiper Belt" - the asteroid belt beyond the orbit of Neptune. More than 1000 Kuiper Belt objects have currently been discovered, of which the most massive now known is not Pluto, but the object designated 163199 Eris, which is 27% more massive than Pluto and is estimated to have a diameter of around 2400km. Logically, if you call Pluto a planet, you have to call Eris one too. Do you want to do that?
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Yay! We have an even ten planets!!