Perseverance is a NASA rover that has operated in and around Jezero Crater on Mars since February 18, 2021. The 1,025-kilogram vehicle is the centerpiece of the Mars 2020 mission, built and managed by the Jet Propulsion Laboratory (JPL). Its assignment is to characterize the crater's ancient lake and river delta, search for preserved signs of past microbial life, and seal rock cores in tubes for a possible future return to Earth.[1]
The rover launched on July 30, 2020, aboard an Atlas V 541 from Cape Canaveral. Its chassis is derived from the older Curiosity rover, with upgrades that include more capable autonomous driving software, 23 cameras, two microphones, and a sampling system built around 43 ultraclean tubes. Power comes from a radioisotope thermoelectric generator. The mission also carried two technology demonstrations: the Ingenuity helicopter, the first aircraft to fly on another planet, and the MOXIE oxygen generator.[1]
By mid-2026 Perseverance had driven nearly 42 kilometers, climbed out of Jezero Crater, and begun studying some of the oldest rocks it has yet encountered along the crater rim.[2] Its most discussed result so far is a mudstone called Cheyava Falls, cored in 2024, which NASA and a 2025 peer-reviewed study describe as holding a potential biosignature.[3][4]
Design and landing
Perseverance reached Mars after a 203-day cruise and descended through the atmosphere on February 18, 2021, using a guided entry, a supersonic parachute, and a rocket-powered sky crane that lowered the rover to the surface on nylon cords. It was the first Mars lander to use terrain-relative navigation, comparing camera images against onboard maps during descent to steer away from hazards. The touchdown point was later named Octavia E. Butler Landing.[1]
Jezero, a crater about 45 kilometers wide on the western edge of the Isidis basin, was selected because a river once breached its rim and built a delta into a crater lake roughly 3.5 billion years ago. Orbital data showed carbonates and clays there, minerals that on Earth are good at preserving traces of life. The rover's seven science instruments, including the SuperCam laser spectrometer, the PIXL X-ray spectrometer, and the SHERLOC ultraviolet Raman instrument, were chosen to examine such rocks at fine scale.[1]
Ingenuity and MOXIE
Ingenuity, a 1.8-kilogram solar-powered helicopter, was designed for up to five experimental flights in 30 days. After its first hop on April 19, 2021, it kept flying for almost three years as a scout, completing 72 flights, logging more than two hours in the air, and covering about 17 kilometers of ground track. The program ended in January 2024 after rotor blade damage sustained on its final flight left it unable to fly again.[1]
MOXIE, the Mars Oxygen In-Situ Resource Utilization Experiment, converted carbon dioxide from the Martian atmosphere into oxygen 16 times between 2021 and September 2023. It produced 122 grams of oxygen in total, at rates up to 12 grams per hour and purities near 98 percent. Scaled-up versions could one day supply propellant oxidizer and breathable air for crews.[1]
Science campaigns and sample caching
| Campaign | Period | Focus |
|---|---|---|
| Crater floor | 2021-2022 | Igneous rocks of the Seitah and Maaz formations |
| Delta front | 2022-2023 | Sedimentary rocks of the ancient river delta |
| Upper fan | 2023 | Delta-top deposits and old river channels |
| Margin unit | 2023-2024 | Carbonate-bearing rocks along the crater's inner edge |
| Northern Rim | 2024-present | Uplifted ancient rocks on and beyond the crater rim |
Sampling runs through every campaign. As of July 2025 the rover had filled 33 of its 43 tubes: 27 rock cores, two regolith samples, one atmospheric sample, and three witness tubes that track contamination.[5] Ten tubes were dropped at a flat site called Three Forks between December 2022 and January 2023 as a backup depot; the remainder stay aboard the rover, which was long expected to hand them to a retrieval lander.[5]
Mars Sample Return status
The cores were collected for Mars Sample Return (MSR), a campaign planned jointly with the European Space Agency. A 2023 independent review estimated MSR would cost 8 to 11 billion dollars and might not deliver samples until 2040, prompting NASA to seek cheaper designs. In January 2025 the agency outlined two alternative architectures, one using a sky crane derivative and one using commercial heavy landers, with return targeted between 2035 and 2039.[6]
The program then lost political support. The administration's fiscal year 2026 budget proposal sought to cancel MSR, and a spending package that moved through Congress in January 2026 stripped nearly all of its funding, redirecting about 110 million dollars into a broader "Mars Future Missions" account intended to preserve entry, descent, and landing technology work. As of mid-2026 no retrieval mission is confirmed, and the samples remain on Mars with no set pickup date.[6] The rover team continues surface science regardless, treating the cached tubes as a long-term asset.[7]
Cheyava Falls potential biosignature
In July 2024, inside an ancient river channel called Neretva Vallis, Perseverance examined an arrowhead-shaped mudstone named Cheyava Falls in the Bright Angel formation. The rock contains organic carbon alongside millimeter-scale "leopard spot" features rimmed by vivianite, an iron phosphate, and greigite, an iron sulfide. On Earth, mineral patterns like these can form when microbes consume organic matter, though non-biological chemistry can produce similar textures.[3]
The rover sealed a core from the rock, named Sapphire Canyon, and the science team spent a year testing alternative explanations. The analysis was published in Nature in September 2025, and NASA stated the sample holds one of the strongest potential biosignatures yet found on Mars. A potential biosignature is not a detection of life; the team notes that settling the question would probably require Earth laboratories, which is one argument for eventually retrieving the samples.[3][4]
Crater rim campaign and status in 2026
Perseverance finished a roughly 500-meter climb up Jezero's western wall in December 2024, topping out at a site called Lookout Hill. Its fifth science campaign, Northern Rim, examines rock thrown up from deep in the crust by the impact that formed the crater; some outcrops may predate Jezero itself and rank among the oldest material any rover has studied in place.[2][7] During 2025 the rover documented layered outcrops at Witch Hazel Hill, and by mid-2026 it was working in an area nicknamed Lac de Charmes, west of the rim.[2]
Operations continue to evolve. In December 2025 the mission executed the first Mars drives planned by an artificial intelligence system, on December 8 and 10, as an experiment in faster route planning.[8] JPL reports the rover is in good health, with its instruments functioning and enough power margin to support years of further exploration.[2]
References
- Perseverance (rover) - Wikipedia.
- NASA's Perseverance Rover Snaps Selfie in Mars' Western Frontier - NASA Jet Propulsion Laboratory.
- NASA Says Mars Rover Discovered Potential Biosignature Last Year - NASA Jet Propulsion Laboratory.
- Redox-driven mineral and organic associations in Jezero Crater, Mars - Nature.
- The 33 Sample Tubes Collected by Perseverance - NASA Jet Propulsion Laboratory.
- The Fate of NASA's Mars Sample Return Program May Be Decided in 2026 - Scientific American.
- Perseverance continues science mission amid uncertainty about Mars Sample Return - SpaceNews.
- Perseverance rover completes first AI-planned drive on Mars - Phys.org.
