the gravity of earth not zero. Zero gravity is in space. If the moon had zero gravity the robot would pogo once and sail off into space forever. DM please get someone to review your articles before you hit the publish button. Surely the time has come to stop designing vehicles to explore planets and actually begin using a few of them. There must be hundreds if not thousands of designs by now lying around in Universities and workshops around the world. Why not actually fire them all at the moon and have a massive bot free for all to see which could gather the most data. All those robots struggling to get the best samples or data may even be a refreshing change from reality TV. This jumping method of lunar transport was suggested in the old Gerry Anderson sci-fi series UFO. That was made in 1969 so I guess there's nothing that new in the principle just that the technology might now be viable to make it a reality.