Perseverance and Curiosity Advance Mars Science Missions
NASA’s Perseverance rover, which touched down on Mars in February 2021, has entered a new operational phase after supporting the Ingenuity helicopter’s early flights. This transition marks a shift from technology demonstration to an operations demonstration, with the rover’s focus now turning toward its core science objectives. Perseverance Surface Mission Manager Jessica Samuels explained, “With this recent fifth helicopter flight we’re transitioning from the technology demonstration phase to more of an operations demonstration phase as we now turn our attention more towards the robotic arm science-based portion of the mission, and as we prepare for the sample acquisition phase of the project.”
The rover recently completed its first close-up robotic arm science target observation using the SHERLOC instrument. The WATSON camera, part of SHERLOC, was maneuvered progressively closer to the Martian surface, achieving a final distance of just 3.7 millimeters. This precision positioning capability is critical for detailed imaging and spectroscopic analysis of rock and soil textures, enabling scientists to identify promising targets for sampling.
Preparations for sample collection are well underway. The mission team is ensuring that Perseverance can safely position and operate its coring drill on Mars. Samuels noted that initial tests involved loading the core drill and pressing it against the rover itself, followed by a successful demonstration of placing the core directly on the Martian surface. These rehearsals validate the mechanical and control systems needed for the complex task of extracting, sealing, and storing samples that will eventually be returned to Earth by a future mission.
Mobility remains a key element of the mission’s success. Perseverance has already traveled 345 meters across Jezero Crater, with plans to expand autonomous navigation capabilities in the coming weeks. Enhanced autonomy will allow the rover to traverse “hundreds and hundreds of meters ahead,” according to Samuels, enabling access to diverse geological features and potential biosignature-bearing sites.
While Perseverance begins its science campaign, NASA’s Curiosity rover continues its long-term exploration of Gale Crater, where it has been operating since 2012. Curiosity Deputy Project Scientist Abigail Fraeman reported that the rover recently completed its investigation of the Glen Torridon region and is now seeking the transition zone between clay-rich rocks—formed in ancient lakes—and sulfate-bearing rocks, which indicate more arid conditions in Mars’ past.
This search began at a location informally named “Mont Mercou,” a striking 20-foot-high cliff sculpted by erosion. Curiosity drilled into the base of the cliff, captured a rover “selfie,” and documented hundreds of fine sedimentary layers exposed in the rock face. Fraeman emphasized that analyzing these layers will reveal details about the geologic processes that shaped the region, offering clues to Mars’ environmental history.
Following its work at the base, Curiosity ascended Mont Mercou and captured a sweeping 360-degree color panorama. “I love this image because if you look off to one side you can see the floor of Gale crater where Curiosity landed. We’ve since climbed over 1300 feet to get to where we are now on the side of the mound. And if you look off to the other side you can see the terrain further ahead,” Fraeman said. The panorama frames the rover’s journey from its landing site to its current position, as well as the distant hills identified from orbital data as containing sulfate minerals.
The sulfate-rich region ahead is of particular interest because such minerals can preserve chemical signatures of past environments, including potential evidence of ancient microbial life. By correlating orbital observations with in-situ measurements, the Curiosity team aims to reconstruct the climatic and hydrological evolution of Gale Crater over billions of years.
Together, Perseverance and Curiosity represent complementary approaches to Mars exploration: one preparing to collect and cache samples for eventual return to Earth, the other conducting detailed geological surveys to unravel the planet’s environmental history. Both missions rely on advanced robotics, precision instrumentation, and autonomous navigation systems—technologies that not only drive planetary science forward but also inspire engineering innovations across multiple disciplines.
