The Mars rover, that self-propelled, solar powered box o' sensors 'n stuff that slowly inches along the surface (and battles the fierce environment) of the red planet may be a mainstay of space exploration, but it's certainly not the only way to get the job done. For instance, the kids at Draper Labs -- last seen in this space with their injectable nanosensor -- are in the process of developing vehicles that would (literally) leave traditional rovers in the dust. The Draper Hopper prototype is designed with a ducted fan propulsion system that uses compress
