............... Conclusions

• The main asteroid belt contains a surprising diversity of objects.
  • Ranging from primitive ice/rock mixtures to igneous rocks.
• Standard argument is that the nebula experienced radical chemical changes here.
• Here we show that some of this variation was produced by dynamical processes.
  • I.e. the capture of comets during a period of planetary orbital evolution.
  • Indeed, we reproduce the orbital distribution of P/D-type asteroids.
  • The remaing issue is explaining the discrepancy in number. See Bottke's talk (next) .
• These results fundamentally change our view of the asteroid belt because they imply that the observed diversity says as much about the dynamical processes of planet formation as it does about the intrinsic variation of the proto-planetary disk.

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This talk can be found at www.boulder.swri.edu/~hal/talks.html
We are grateful to NASA's Origins, PG&G, OPR programs for support. ...............