Either way, we need much more efficient, much lighter shielding than we currently have. It’s just one of the. Any significant breakthroughs required to make tri

Either way, we need much more efficient, much lighter shielding than we currently have. It’s just one of the. Any significant breakthroughs required to make trips to Mars (for humans) remotely practical. Far more likely, if less romantic to some, is going to be a future of robotic exploration and mining. Once that’s well underway, sending humans on long journeys becomes far more feasible.