Robot rover tackles uneven ground using screw drive

Some day in the future, it's possible that an unmanned rover may go trundling across the Martian landscape not on wheels, but on three rotating steel coils. While able to traverse rugged terrain without getting stuck, it could also move sideways to get around obstacles, would be unlikely to malfunction as it would have very few moving parts, and could perhaps even remain mobile if it were to take a tumble and flip over. Although such a vehicle might not be exploring Mars any time particularly soon, a fully-functioning prototype does already exist here on Earth, and its design could find terrestrial applications.

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