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rangutan
München
In 2003 an object larger than Pluto was discovered about 97 times the distance of the Earth from the sun, 97 AUs (Pluto is at about 40AU). After a few years of observation and discovering that it also has a moon of its own, the objects name was changed from “2003 UB313” to planet “Xena” and internationally acknowledged. Its discovery was no surprise to mathematicians since all mass in the solar system can be accounted for but there is always some missing! Each planet is roughly double the distance from the sun as the previous. The 11th planet, let’s call it “Rangutan” for now, will be found roughly at 180-200 AUs, a twelvth, say “Benson”, at around 400 AU perhaps too. After that interstellical gravity may be greater than that from our solar system?
Ref: http://www.tenthplanet.info/
[A 2500 strong commision in Prage removed Pluto from the list of planets on 2006-08-23]
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