Meet the competitors for the Lunar XPrize! They've dreamt up tiny rolling rovers meant to delve into dormant lava tubes in the moon, "hopping" rockets that after landing can take off again using spare fuel, and other fascinating innovations, with the goal of landing their rovers on the moon, travel 500 meters (more difficult than you'd think!) and send high-definition footage back to Earth.
(YouTube video/GoogleLunarXPRIZE)