Earth, the Moon, Mars is a reasonable power base for mankind over a span of a few hundred years. After that things get real tricky but there’s several moons around to colonize in the outer planets, assuming we can get some solid radiation shielding. After that though, we’re going to need to start messing with fundamental laws that DO NOT like to be messed with to go anywhere else.
Earth, the Moon, Mars is a reasonable power base for mankind over a span of a few hundred years. After that things get real tricky but there’s several moons around to colonize in the outer planets, assuming we can get some solid radiation shielding. After that though, we’re going to need to start messing with fundamental laws that DO NOT like to be messed with to go anywhere else.