Sure just take all the resources needed for your survival from earth and then slag it off for the moon, cause thats fair. Poor earth..
Strange beautiful grass of green, With your majestic silver seas Your mysterious mountains I wish to see closer May I land my kinky machine?
Take a look at Paradox Interactive, with games such as Europa Universalis. Loads better than Total War in my opinion. Or perhaps you'd like Supreme Commander (1 and Forged Alliance, not 2), although those are quite different from Total War.