The author of Orbiter has a PH.D, but he did the game as a hobby on his free time.
Orbiter is not just the physics simulations, its the whole of the add-ons and the physics simulations.
And the add-ons (ranging from NASSP,AMSO, Mercury, Gemini, 2001 a Space Odyssey, Deltaglider etc...) were community created, because of a very well designed api.
This is Orbiter today, and it definitely is not a one mans job.
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