The IAU's Definition - Numerical Model
If we put test particles between and slightly beyond the 8 planets, we find:
Fates are different:
.......
| | Hit Planet | Hit Sun | Ejected |
| Between Terrestrial Planets | 59% | 41% | 0 |
| Between Giant Planets | 3% | 1% | 96% |
This is why it is difficult to understand giant planet formation! (see Levison & Stewart 2001)
click
