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pre-solar nebulae collisions


I was wondering how collisions occurred in the early, pre- and post-
solar nebulae.

As the dust cloud was accreting and falling inward, the dust was
spiralling towards the center and frictional forces probably kept
most of the particles moving at nearly the same velocity, certainly
in the same direction.  

After the sun ignited and blew away the fine dust, the remaining
larger objects were still orbitting or spiralling inwards so the same
thing would seem to apply.

My only way out of this obvious dilemma is to assume that the larger
objects must have cause considerable perturbations in the orbits of
the smaller objects, sending them sunward or outward.

Probably there was always a large blob near where Jupiter now resides
since that was outside the T Tauri condensation limits (which are
nearly 3 AU for solar-sized masses).

Does this seem correct?

-- 
          Jim Hurley
       Arachnaut's Lair
http://www.arachnaut.org/ >
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