Terraformed/Vasuformed planets? (yey, new word!)
Mars might be Terra 2, Arcadia stations around the gas giants to oversee gas mining operations, asteroid mining in the inner and outer asteroid belts, Pluto being re-classified as planet, the remnants of Vulcan being towed away from the sun and reshaped into a mobile base of operations...or maybe using large asteroids to become mobile field bases (might be how Bosch got the idea to camouflage the Iceni like an Asteroid). Who knows? Anything is possible; we do not know how far things have gone with the whole colonization business.
AFAIK the Terrans colonized only planets that are Earthlike, or like one. It is a rather interesting topic, though.I need to awaken my brains to get a good answer up other than this one (something more plausible than what I have uttered up thre, at least)