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(关于Pluto认知的controversy, 目前official认为是planet)
Orbiting sun的small object found within K Belt
KBOs basic info
- far from N—able survive
- unsure reasons make them excited
KBOs有large, eccentric orbits
1. N scattering effectout of solar system entirely
2. also Nplanet-crossing orbits
3. KBO-sun twice; N- sun three times
KB much smaller than before
N的developmentcollisionKBO become dust
However, 有的比Pluto大的约70Aus 单位
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