NASA's Jet Propulsion Laboratory is testing a new rover prototype that could transform planetary exploration. The Exploration Rover for Navigating Extreme Sloped Terrain, or Ernest, addresses major limitations of current Mars rovers that crawl at less than 0.1 mph and struggle with rocky terrain. Testing in the Colorado Desert shows Ernest can lift its wheels individually to climb obstacles and navigate steep slopes that would force detours on existing missions.

Ernest sports four wheels instead of the traditional six, with active suspension featuring powered joints that enable multiple driving gaits. The prototype drove for over 37 hours across seven days, covering approximately 16 miles at speeds up to 0.6 mph - six times faster than Perseverance. Its four steerable wheels allow omnidirectional movement, and the system switches between active and passive suspension based on terrain and energy needs.

Since the program began in 2022, engineers have tested nearly a dozen suspension configurations. The latest iteration includes enhanced independent decision-making capabilities, reducing reliance on Earth-based controllers for navigation choices. This represents a shift from the passive rocker-bogie system that has guided Mars rovers since the 1990s.

The technology could enable future rovers to traverse significantly more ground on both Mars and the Moon. Instead of taking months to reach targets, missions could cover distances in weeks, expanding scientific reach while minimizing wheel damage from sharp rocks and abrasive sand.