NASA’s self-driving Perseverance rover has broken the all-time off-world driving record and is now exploring ancient Martian terrain that could hold clues to the Red Planet’s long-lost history.
NASA’s Perseverance rover has set a new record for driving on another world, traveling farther across the surface of Mars than any vehicle in history. On October 11, its total distance reached 28.10 miles (45.22 kilometers), surpassing the previous record of 28.06 miles (45.16 kilometers) held by NASA’s Opportunity rover, which operated on Mars from 2004 to 2018. Perseverance achieved the milestone on its 2,006th Martian day, known as a sol, completing in just five and a half years a journey that took Opportunity nearly 15.
The record was broken as Perseverance made its way toward a location called “Idubi,” passing through an area nicknamed “Lac de Charmes” just beyond the western edge of Jezero Crater. Scientists believe this region contains some of the most ancient terrain ever investigated in the solar system. Comparable rocks on Earth have largely disappeared because of erosion and plate tectonics (Mars doesn’t have tectonic plates). At Idubi, researchers hope to uncover evidence of ancient hydrothermal systems, where hot water once interacted with surrounding rock.
How NASA’s Self-Driving Mars Rover Broke the Record
A major reason Perseverance has been able to travel so far is its sophisticated autonomous driving technology. Its navigation system, called AutoNav, allows the rover to analyze its surroundings and choose a safe route while moving. As it drives, Perseverance captures images, creates three-dimensional maps of potential obstacles, and determines how to travel between destinations chosen by engineers on Earth. NASA describes this ability as “thinking while driving.”
Unlike earlier rovers, Perseverance can perform these calculations while traveling at or close to its maximum speed. It has covered as much as 1,351 feet (412 meters) in a single Martian day. More than 90% of its total driving distance has involved AutoNav evaluating the terrain, a dramatic improvement over the roughly 5% achieved by the first Martian AutoNav system used by Opportunity and its twin rover, Spirit.
The difference in computing capability is equally remarkable. NASA’s first Mars rover, Sojourner, relied on just 20 measurement points to evaluate the ground ahead. Perseverance now analyzes 600,000 points every time it examines the terrain.
“It is an honor to be working on Perseverance at a moment when the technology has evolved to the point that drives like these are routine,” said Steven Lee, the project manager of the Curiosity and Perseverance rovers at NASA’s Jet Propulsion Laboratory in Southern California. “The original mission called for no more than 12.4 miles of driving. We’ve blown well past that, and with all mobility systems fully operational and favorable extended-ground-life test results, we expect Perseverance to keep adding to this record for many years to come.”
NASA has already authorized the first extension of the Perseverance mission. The extended phase began in October and is expected to keep the rover investigating the rim of Jezero Crater through approximately the end of 2028.
Nearly 30 Years of Mars Rover Exploration
Perseverance’s accomplishment builds on nearly three decades of robotic exploration on Mars. With each new generation, NASA has developed rovers capable of traveling greater distances and navigating increasingly challenging landscapes.
The journey began in 1997 with Sojourner, a small rover roughly the size of a microwave oven. During its 83-sol mission, it traveled approximately 330 feet (100 meters). In 2004, NASA sent the much larger, golf-cart-sized rovers Spirit and Opportunity to Mars. Although both were originally designed for missions lasting just 90 sols, they went on to far exceed expectations.
Spirit traveled 4.8 miles (7.7 kilometers) before its mission ended during the harsh Martian winter of 2010. Opportunity proved even more durable, operating for 5,111 sols and completing the first marathon-distance drive on another world in 2015. Its extraordinary journey established the distance record that Perseverance has now broken.
NASA’s Curiosity rover, which arrived at Gale Crater in 2012 and continues exploring Mars, has accumulated more than 23.65 miles (38.07 kilometers) of driving.
A Smarter Mars Rover That Keeps Improving
Perseverance is not simply traveling farther than its predecessors. Its ability to navigate independently has continued to improve since it landed on Mars.
“The rover that broke this record did so by making its own decisions about the path. Given the autonomy to just go, Perseverance is a better driver than the one that landed, and we’re not done,” Mark Maimone, deputy team chief for robotic operations on Perseverance. “Our newest software teaches Perseverance to steer less and roll more, and to check its own position against orbital maps mid-drive. The next frontier is sunlight itself. Glare in the navigation cameras is why we park by mid-afternoon if we’re driving toward the Sun, and if we can teach the rover to see past those artifacts, every rover that follows gets a longer working day.”
Before surpassing Opportunity’s Mars record, Perseverance had already traveled farther than vehicles driven on the Moon. Its journey exceeded the 22.2 miles (35.7 kilometers) covered by Apollo 17 astronauts Gene Cernan and Harrison Schmitt in 1972, as well as the 24.2 miles (39 kilometers) traveled by the Soviet Lunokhod 2 rover in 1973.
These achievements demonstrate how much robotic mobility has advanced, but setting records is not the mission’s primary objective. The real advantage of traveling farther and faster is that scientists can investigate more locations, examine a wider variety of rocks, and piece together a more complete picture of Mars’ ancient history.
Searching for Ancient Life in 4-Billion-Year-Old Rocks
Perseverance’s growing range has allowed it to explore several dramatically different Martian environments. Its journey began on the floor of an ancient lake, continued through the remains of a long-vanished river system, and eventually brought it to the rim of Jezero Crater.
Along the way, the rover discovered a rock called “Cheyava Falls” containing a potential biosignature, a feature that could provide evidence of ancient biological activity. Scientists are now investigating another type of environment that may once have offered conditions suitable for life: hydrothermal systems associated with heated water and rock.
So far, Perseverance has gathered 29 samples of rock and regolith, the loose material covering the Martian surface. These samples represent several distinct geological settings, including the crater floor, a delta formed by an ancient river, and the surrounding crater rim.
Near the rim, the rover has been studying rocks formed or altered by powerful impacts roughly 4 billion years ago. These formations preserve evidence from an extremely early period of planetary history, much of which has been destroyed or transformed by geological processes on Earth.
After completing its investigation of Lac de Charmes, Perseverance is expected to continue following the crater rim before turning south during its extended mission. One of its destinations is Rainbow Falls, an enormous block of ancient crust measuring 328 feet (100 meters) across that was pushed upward by the impact responsible for creating Jezero Crater.
With its driving systems still functioning and years of additional exploration planned, Perseverance is positioned to keep extending its record while uncovering new clues about the Red Planet’s distant past.
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