NASA’s Perseverance rover is now the farthest-traveled vehicle ever driven on another world. On Oct. 11, its odometer reached 28.10 miles (45.22 kilometers), edging past the 28.06 miles (45.16 kilometers) logged by NASA’s Opportunity rover, which held the record for years after its mission ended in 2018.
The new mark came on sol 2,006, the rover’s 2,006th Martian day. Perseverance covered the distance in about five and a half years. Opportunity needed almost 15.
Why This Is a Bigger Deal Than It Sounds
Perseverance was never meant to roam this far. Its original mission plan called for no more than 12.4 miles of driving, so the rover has already gone more than twice its design goal, and NASA says its wheels and drive systems are still fully operational.
Driving on Mars is slow and risky. Radio signals take minutes to travel each way, so nobody on Earth can steer the rover in real time. A single bad step into soft sand or onto a sharp rock could end a mission. Every mile is the product of careful planning, good hardware and, increasingly, software that lets the rover make its own decisions.
The Secret: A Rover That Thinks While It Drives
Most of Perseverance’s mileage comes from an autonomous navigation system called AutoNav. Engineers on Earth set waypoints, and the rover does the rest: it photographs the ground as it rolls, builds a 3D map of hazards, and picks its own path between the waypoints. The team at NASA’s Jet Propulsion Laboratory (JPL) in Southern California calls it “thinking while driving.”
The numbers show how far the technology has come:
- More than 90% of Perseverance’s total distance was driven on AutoNav. Spirit and Opportunity, which carried the first Martian version of the system, used it for only about 5% of theirs.
- Sojourner, NASA’s first Mars rover in 1997, checked 20 points to judge the path ahead. Perseverance processes about 600,000 per look.
- Perseverance can cover up to 1,351 feet (412 meters) in a single sol, roughly the length of four and a half football fields.
Mark Maimone, deputy team chief for robotic operations on Perseverance, said the rover is a better driver now than when it landed. The next problem his team wants to solve is glare: when the rover drives toward the Sun, light in the navigation cameras forces it to park by mid-afternoon.
How Perseverance Stacks Up
Here is how the record looks next to other vehicles that have driven beyond Earth, using figures NASA gave alongside the announcement:
- Perseverance (Mars, 2021–present): 28.10 miles and counting.
- Opportunity (Mars, 2004–2018): 28.06 miles over 5,111 sols.
- Lunokhod 2 (Soviet Moon rover): 24.2 miles.
- Curiosity (Mars, 2012–present): more than 23.65 miles (38.07 kilometers).
- Apollo 17 lunar rover: 22.2 miles.
- Spirit (Mars, 2004–2010): 4.8 miles (7.7 kilometers).
- Sojourner (Mars, 1997): about 330 feet (100 meters) during an 83-sol mission.
In other words, Perseverance has now passed the longest drives ever made on the Moon, too, including the astronauts’ own buggy on the final Apollo mission. Curiosity, which shares a project manager with Perseverance, is still driving and still adding miles of its own.
Where It’s Headed Next
When it set the record, Perseverance was on its way to a spot called “Idubi” in an area just off the western rim of Jezero Crater that the team has nicknamed “Lac de Charmes.” The rocks there may be among the oldest the rover has seen, and scientists hope they hold traces of ancient hydrothermal systems, places where hot water once circulated through rock.
After that, the plan is to follow the crater rim south toward “Rainbow Falls,” a block of ancient crust about 328 feet (100 meters) wide that was pushed up by the impact that created Jezero.
NASA recently approved the mission’s first extension, which began this month and runs through roughly the end of 2028. Steven Lee, who manages both the Curiosity and Perseverance projects at JPL, said the team expects the rover to keep stretching its record for years, pointing to healthy mobility systems and encouraging results from long-duration ground testing of its hardware.
The Bigger Picture
The miles are a means to an end. Perseverance’s main job is to look for signs of ancient life and collect samples. So far it has gathered 29 rock and regolith samples, and it found a potential biosignature in a rock nicknamed “Cheyava Falls.” A potential biosignature is a feature that could have been made by life but might also have a non-biological explanation, which is why scientists want to study such samples in labs on Earth.
Every extra mile gives the team access to new kinds of rock, and each one widens the set of places where the rover can look for those clues.
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