Throughout history, humankind has shared an innate trait – the desire to explore. Prehistoric men and women may have stood curiously at the opening of caves and wondered what was over the next hill. Centuries later, a teenager in New England envisioned a trip to a distant planet. With the rollout of NASA’s Space Launch System (SLS) mega-rocket and Orion spacecraft, the agency now is preparing a return to the Moon as a steppingstone to an eventual expedition to Mars.