NASA’s Perseverance rover completed a full marathon distance on Mars on June 14, 2026, five years and four months after it began driving, while Opportunity needed 11 years and two months to cover the same 42.195 kilometres. Perseverance was not the first Mars rover to drive with some autonomy, but it has made autonomous driving faster, more continuous and more central to everyday exploration. Human planners still decide where it should go and what science it should do; the rover takes over much of the detailed work of moving safely between instructions. NASA said Perseverance reached marathon distance on its 1,890th Martian day, or sol. The time comparison with Opportunity does not mean Perseverance drove twice as fast every day, because routes, terrain and science stops differ, but it shows its mobility system has supported a sustained working mission. Perseverance can reach only about 152 metres per hour on firm, flat ground. Earth cannot steer a Mars rover in real time because radio commands take minutes to cross the changing distance between the planets, so planners send goals and route instructions in batches. Perseverance’s onboard AutoNav system uses pairs of navigation-camera images to build a three-dimensional view of the ground ahead, estimates the rover’s position, identifies hazards and selects safe arcs around them while continuing to move. NASA calls this “thinking while driving”. Perseverance can dedicate a separate computer to surface navigation, and its cameras expose images faster than