Why do some space robots have six legs and walk like insects?
A. As insects walk, they have two legs on one side on the ground (that is, front and back legs), and only the middle leg on the ground on the other side. This forms a very stable base for walking over rough terrain such as that encountered on many planets and the moon. In actual fact, the mobile robots expected to be used on Mars are probably going to using caterpillar tyres like army tanks.