Not exactly a mission sim, but it is a fun toy...
Gravity Simulator
I downloaded it and it is pretty cool. You can see the orbits of everything in the solar system at any point in time.
I am looking forward to what Craig is building.
Bill
----------------
aka
TheBigDog - Hypography Full Freaking Moderator
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The truth is incontravertible; malice may attack it, ignorance may deride it, but in the end there it is. - Winston Churchill
TheBigDog's recommended reading:
The Science of Success - Charles G. Koch
A neutron goes into a bar and asks the bartender, "How much for a beer?"
The bartender replies, "For you, no charge."
