Will you (OK, your grandchildren) someday take a vacation jaunt to Mars? Or maybe move there permanently? You will if California’s 0utside-the-box-thinker Elon Musk and his competitors have their way. Non-passenger commercial space activity is already big business. Musk’s SpaceX company launches satellites into orbit, charging commercial customers $62 million per launch to as much as $20 million more for more complicated tasks, such as resupplying the International Space Station.