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Open questions<br />
5. Given the apparent highly nonuniform orbital distribution of KBOs, precisely<br />
what is the source region of short period comets and Centaurs? What is the<br />
nature of the long term instabilities that provide dynamical transport routes<br />
from the KB to the short period comet and Centaur population?<br />
6. Was the primordial KB much more massive than at present? What, if any, were<br />
the mass loss mechanisms (collisional grinding, dynamical stirring by large<br />
KBOs or lost planets)?<br />
7. Is there a significant population of Neptune Trojans? Or a belt between Uranus<br />
and Neptune? What can we learn from its presence/absence about the<br />
dynamical history of Neptune?<br />
8. What is the distribution of spins of KBOs? It may help constrain their<br />
collisional evolution.<br />
9. What is the frequency of binaries? (How unique is the Pluto-Charon binary?)<br />
10.What is the relationship between the KB and the Oort Cloud? How does the<br />
mass distribution in the KB relate to the formation of the Oort Cloud? Is there a<br />
continuum of small bodies spanning the two regions?
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