The NASA-run Northrop Grumman Lunar Lander Challenge requires an unmanned rocket-powered craft to lift off, go to another pad at least 100 meters away, refuel, and return. It's not as easy as it looks. A well-financed team from Armadillo Aerospace thought they had it nailed this year, but they had four tries, and none of them made it. On the fourth, engine exploded on launch.
COMMENT: The engineers of Armadillo say they will get it next year, and I hope they do. NASA's prize challenges are a great idea, something to involve smaller companies in developing innovative technology for space exploration.