NASA’s Spirit Rover has just completed a long hard slog across difficult Martian terrain to reach the Columbia hills. The short journey of just a couple of kilometres has taken Spirit months. Imagine if it could thoroughly analyze an area and then just pick up and fly somewhere new? NASA is considering a proposal from Pioneer Astronautics, which envisions a vehicle that could land on Mars, refuel with local materials, and then fly hundreds of kilometres to explore; repeating this process over and over again – the Martian Gashopper Aircraft.