In this NASA eClips video segment learn about the mobile robot NASA plans to use for future missions to Mars: the All-Terrain Hex-Limbed Extra-Terrestrial Explorer, or Athlete. Athlete is a six-legged, wheeled, mobile robot that will be used to move the astronauts habitat as well as serve many other purposes for the mission. NASA is currently testing Athlete on Earth using the mathematics concept, scaling and ratios. Learn how NASA is able to test a model of Athlete, which is only 1/3 the size of the actual mobile robot! credit: NASA