Meet SpaceHopper, a three-legged hopping asteroid explorer

Created by students at ETH Zurich in Switzerland, the bouncy bot is designed for exploring microgravity environments, such as asteroids.

Apollo mission astronauts who visited the moon between 1969 and 1972 found a hopping motion useful for navigating its surface, where the gravity is one-sixth of Earth’s. Today, robots are playing a leading role in space exploration, and some are taking cues from those bunny-hopping astronauts. That includes SpaceHopper, a three-legged robot designed for exploring microgravity environments, like the surface of asteroids.

ETH Zurich students say SpaceHopper – which was trained using reinforcement learning, a technique that teaches AI to make decisions based on trial and error – allows more controlled movement than past asteroid explorers. “So, when we want to go to that crater, we can go to that crater,” said Schelbert. A three-legged hopping robot that can reorient itself in zero gravity is “a completely new idea,” said Florian Kehl, a lecturer in the Department of Earth and Planetary Sciences of ETH Zurich.

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