On 7/24/2018 10:47 AM, Jeffrey Cornish wrote:

> I would suggest trying out Kerbal Space program.  The primary planet,
> Kerbin, has two satellites, the Mün and Moho, that orbit in the same
> plane as Kerbin's orbit around it's primary, Kerbol, so this scenario
> can be tried out.

Just a quick correction - Minmus, the further and smaller moon of
Kerbin, does NOT orbit in the same plane.  (And Moho is the 'Mercury' of
the system, Kerbol I.)

That said, there are mods that let one MOVE THE HEAVENS and rearrange
things to your liking... for example, swapping Moho in for Minmus and
making its orbit co-planar. :)

Be aware that KSP will not address the stability issue (which, based on
Mr. Cornish' post, may be a good thing); moons and planets are "on
rails".  Only asteroids and smaller objects (like ships) are subject to
real physics, or an approximation thereof.

--
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Kelly St. Clair
xxxxxx@efn.org