JPL engineers test the All-Terrain, Hex-Limbed, Extra-Terrestrial Explorer (ATHLETE) at the Hahamongna Watershed Park in Pasadena on Thursday, July 29, 2010. This machine is a half-scale working prototype of a robot under development to transport habitats and other cargo on the surface of the Moon or Mars. The ATHLETE concept, according to JPL, is a level cargo deck carried by 6 wheels, each on the end of a configurable leg. This prototype stands avout 15 feet tall and 15 feet wide.