Nasa hosts moonbuggy race in Alabama
14 April 2012 Last updated at 22:08 BST
Teams from around the world have descended on Huntsville, Alabama for Nasa's annual Great Moonbuggy Race.
More than 500 high school and college students competing in human-powered vehicles were inspired by the lunar rovers that astronauts used on the moon.
They have to complete a half-mile race course - navigating obstacles on the way which are designed to simulate the surface of the moon - in the fastest time.
Diedra Williams, the Great Moonbuggy Race Project Manager, said the event was a learning experience as well as a fun one.