Mountain goat-inspired robotic hooves for exploring the Moon and Mars

What is it about?

Robots sent to explore the Moon and Mars struggle to move across steep slopes, loose soil, and rocky terrain. Mountain goats, by contrast, navigate extreme rocky landscapes with remarkable stability thanks to the structure of their hooves, which combine a hard outer wall with a soft, shock-absorbing inner pad. This study uses that biological design as a blueprint for a new robotic foot. The team evaluated three manufacturing materials at different cost and performance levels, ran computer simulations to check that the design can handle the forces a walking robot produces, and 3D-printed early prototypes sized for a quadruped robot. The results show the hoof geometry holds up well under load, and the next steps will involve multi-material prototypes tested on simulated lunar and Martian soil.

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Photo by Jon Sailer on Unsplash

Photo by Jon Sailer on Unsplash

Why is it important?

Most planetary rovers use wheels, which wear down quickly on sharp rocks and cannot access steep or boulder-filled areas where the most valuable science targets often sit. Legged robots can reach these places, but their rigid feet still slip and lose grip on loose regolith. This work addresses that gap by proposing a foot that passively conforms to rough surfaces, the same way a mountain goat hoof does, without relying on complex sensors or control software. Because the design uses commercially available 3D-printing materials and a staged prototyping strategy from low-cost PLA up to aerospace-grade PEEK, it offers a practical path from lab concept to flight hardware. Improved foot traction could expand the reachable terrain for future planetary missions and reduce the energy robots spend just staying upright.

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