Technically it's possible. If nothing else you can build an army and come extremely close to winning domination (forcing most civs into an involuntary OCC with only one of them keeping their capital) but pick a peaceful victory condition. (Hum, BNW changed the domination rule so you can now have one of the civs keep some other AI's capital)
In fact back in the Civ II days, I would often conquer the world except for 1 city and then launch the space ship. But I haven't had the patience for that since SMAC.
In fact back in the Civ II days, I would often conquer the world except for 1 city and then launch the space ship. But I haven't had the patience for that since SMAC.