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The Planet V Hypothesis
(Chambers 2007)

There was a small planet in the inner asteroid belt.
Its orbit went unstable after 700Myr.
- Chambers did a large number simulations.
  - Included all the planets but Mercury.
  - Added a Moon- to Mars-mass planet.
  - 1.5<a<2.0AU.
- In 19% simulations:
  - the planet went unstable after 200Myr,
  - and did not hit another planet.
This destabilized the asteroid belt LHB.
- Chambers did not study this important part.
- So, we do not know:
  1. if this supplies the correct flux to the Moon.
  2. if the temporal evolution of this spike is consistent with observations.
  3. if it leaves an asteroid belt that is consistent with observations.