(January 2, 2015 at 12:43 pm)Rhythm Wrote: It's still cheaper and more advantageous to stack people on top of each other. There's so much room to spare "up" that I doubt we'll ever "run out of space".Pretty much this.
Barring physical catastrophe to Earth, I think we're more likely to see Earth become Coruscant than we are to see colonies on Mars.
Not that Martian colonies won't happen, just that building "up" is more feasible, and at least currently possible.