The 4
1
/
2
Steps of Planet Formation in the Solar System. (cont)
Step II:
Big guys grow faster than small guys
Runaway Growth.
..............
(Greenberg et al. 1978; Wetherill & Stewart )
.
.............
And since
.
Example: Weidenschilling et al. (1997)
As long as
is not affected by big guys.
Breaks down when mass is ~10
24-25
g in a
Minimum Mass Solar Nebula
. (Ida & Makino)
Takes ~100,000 yrs (very uncertain).
..............
. 
is not affected by big guys.
Runaway Growth.
..............
. is not affected by big guys.
