I’ve been fiddling with the idea and such. What would be the worth of making a game with a full planet that you can go from point A and eventually end up back at point A? I thought it would be pretty cool, are there any great advantages to something like this as a feature you’d look for in a game or should I stick to the plain terrain? Whats your view on this because I’m kind of torn at the idea. I’m not talking about Super Mario Galaxy like planets or anything like that. I’m talking about something large! That would allow for hours of fun and discovery for the player.
Thanks for any response! I can’t wait to see what you guys think! 
Well there is this - http://forum.unity3d.com/threads/214961-Planetary-Terrain
Kerbal Space Program.
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Don’t they use their own custom planet system?