On a sun-scorched expanse of the Colorado Desert, the compact silhouette of ERNEST rolled steadily over jagged rocks and shifting sands, covering 16 miles in just 37 hours with barely a command from its human handlers. This unassuming four-wheeled prototype—4 feet long and built at NASA’s Jet Propulsion Laboratory—just completed a field test that could reshape how we explore the Moon and Mars. ERNEST, short for Exploration Rover for Navigating Extreme Sloped Terrain, isn’t just another rover; it’s a glimpse into a future where robotic explorers travel faster, farther, and more independently than ever before.
Current Mars rovers like Curiosity and Perseverance crawl at a top speed of about 0.06 mph, limited by their reliance on constant human oversight and passive suspension systems. ERNEST, by contrast, reached speeds of 0.6 mph—ten times faster—thanks to its advanced autonomy software and active suspension system. Over seven days of intermittent driving, it demonstrated the ability to make real-time navigation decisions, adapting to terrain and lighting conditions similar to those on the lunar surface. This leap in capability is critical for future missions that aim to cover hundreds of miles across uncharted, rugged landscapes where direct control from Earth is impractical.
At the heart of ERNEST’s innovation is its hybrid suspension system. Unlike traditional rovers, it can shift between passive and active modes—using powered joints to "walk" over obstacles, climb steep slopes, or even move sideways. Its four steerable wheels and articulated gimbal allow it to adopt different driving gaits, from squirming to wheel-walking, giving it unprecedented agility. The design evolved from two earlier 2-foot prototypes tested in a lab filled with lunar regolith simulant, where the team evaluated 11 different configurations before scaling up to the current model, completed in September 2024.
Led by JPL principal technologist Issa Nesnas and mobility lead Hari Nayar, the team envisions a future rover twice ERNEST’s size, capable of long-range lunar missions that could explore permanently shadowed craters or traverse vast volcanic plains. “You could do a science road trip across the moon—or Mars—with this vehicle,” said planetary scientist James Keane, capturing the spirit of what ERNEST represents: not just a machine, but a new era of exploration. As NASA prepares for sustained lunar presence, ERNEST is proving that the next generation of rovers won’t just follow paths—they’ll forge them.