Computer Models

• Construct a population of embryos analytic local models.

• Follow the orbits of embryos on computer.
  • Things stick if they hit.

• Planets accreted gas if gas present and M > 10 .
  • Lifetime of gas nebula is 10⁷ yrs.

• Followed a system until it is stable for 1 billion years.

Note that we had to do some dishonest thing to get this to work!