Artificial intelligence (AI) will transform the world later this century. I expect this transition will be a "soft takeoff" in which many sectors of society update together in response to incremental AI developments, though the possibility of a harder takeoff in which a single AI project "goes foom" shouldn't be ruled out. If a rogue AI gained control of Earth, it would proceed to accomplish its goals by colonizing the galaxy and undertaking some very interesting achievements in science and engineering...