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By NASA
Explore This Section Perseverance Home Mission Overview Rover Components Mars Rock Samples Where is Perseverance? Ingenuity Mars Helicopter Mission Updates Science Overview Objectives Instruments Highlights Exploration Goals News and Features Multimedia Perseverance Raw Images Images Videos Audio More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 2 min read
Origins Uncertain: ‘Skull Hill’ Rock
Written by Margaret Deahn, Ph.D. Student at Purdue University
Last week, NASA’s Mars 2020 rover continued its journey down lower ‘Witch Hazel Hill’ on the Jezero crater rim. The rover stopped along a boundary visible from orbit dividing light and dark rock outcrop (also known as a contact) at a site the team has called ‘Port Anson’. In addition to this contact, the rover has encountered a variety of neat rocks that may have originated from elsewhere and transported to their current location, also known as float.
This image from NASA’s Mars Perseverance rover, taken by the Mastcam-Z instrument’s right eye, shows the ‘Skull Hill’ target, a dark-toned float rock. The rover acquired this image while driving west downslope towards lower ‘Witch Hazel Hill’. Perseverance acquired this image on April 11, 2025, or sol 1472 of the Mars 2020 mission NASA/JPL-Caltech/ASU Pictured above is an observation named ‘Skull Hill’ taken by the rover’s Mastcam-Z instrument. This float rock uniquely contrasts the surrounding light-toned outcrop with its dark tone and angular surface, and it features a few pits in the rock. If you look closely, you might even spot spherules within the surrounding regolith! See Alex Jones’ recent blog post for more information on these neat features: https://science.nasa.gov/blog/shocking-spherules/. The pits on Skull Hill may have formed via the erosion of clasts from the rock or scouring by wind. We’ve found a few of these dark-toned floats in the Port Anson region, and the team is working to better understand where these rocks came from and how they got here.
Skull Hill’s dark color is reminiscent of meteorites found in Gale crater by the Curiosity rover: https://www.jpl.nasa.gov/news/curiosity-mars-rover-checks-odd-looking-iron-meteorite/. Chemical composition is an important factor in identifying a meteorite, and Gale’s meteorites contain significant amounts of iron and nickel. However, recent analysis of SuperCam data from nearby similar rocks suggests a composition inconsistent with a meteorite origin.
Alternatively, ‘Skull Hill’ could be an igneous rock eroded from a nearby outcrop or ejected from an impact crater. On Earth and Mars, iron and magnesium are some of the main contributors to igneous rocks, which form from the cooling of magma or lava. These rocks can include dark-colored minerals such as olivine, pyroxene, amphibole, and biotite. Luckily for us, the rover has instruments that can measure the chemical composition of rocks on Mars. Understanding the composition of these darker-toned floats will help the team to interpret the origin of this unique rock!
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By European Space Agency
This new snapshot from the European Space Agency’s Mars Express deftly captures the two distinct faces of Mars: ridged and rugged versus smooth and unmarked.
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By NASA
Long before joining NASA’s Test and Evaluation Support Team contract in October 2024, Angel Saenz was already an engineer at heart.
A STEM education program at his high school helped unlock that passion, setting him on a path that would eventually lead to NASA’s White Sands Test Facility in Las Cruces, New Mexico.
Angel Saenz poses in front of a composite overwrap pressure vessel outside of his office at White Sands Test Facility in Las Cruces, New Mexico. NASA/Anthony L. Quiterio The program – FIRST Robotics Competition – is run by global nonprofit, FIRST (For Inspiration and Recognition of Science and Technology). It was the brainchild of prolific inventor Dean Kamen, best known for creating the Segway.
In what the organization calls “the ultimate sport for the mind,” teams of students spend six weeks working under adult mentors—and strict rules—to design, program, and build industrial-sized robots before facing off in a themed tournament. Teams earn points for accomplishing various engineering feats, launching, grappling, and climbing their way through the obstacles of a game that’s less football and more American Ninja Warrior.
Competing during the 2013 and 2014 seasons with the White Sands-sponsored Deming Thundercats, Saenz said FIRST was a link between abstract mathematical ideas and real-world applications.
“Before joining FIRST, equations were just something I was told to solve for a grade, but now I was applying them and seeing how they were actually useful,” he said.
By turning education into an extracurricular activity as compelling as video games and as competitive as any varsity sport, FIRST completely reshaped Saenz’s approach to learning.
“There are lots of other things kids can choose to do outside of school, but engineering was always that thing for me,” he said. “I associate it with being a fun activity, I see it more as a hobby.”
That kind of energy—as any engineer knows—cannot be destroyed. Today Saenz channels it into his work, tackling challenges with White Sand’s Composite Pressure group where he tests and analyzes pressure vessel systems, enabling their safe use in space programs.
“Having that foundation really helps ground me,” he said. “When I see a problem, I can look back and say, ‘That’s like what happened in FIRST Robotics and here’s how we solved it.’”
Deming High School teacher and robotics mentor David Wertz recognized Saenz’s aptitude for engineering, even when Saenz could not yet see it in himself.
“He wasn’t aware that we were using the engineering process as we built our robot,” Wertz said, “but he was always looking for ways to iterate and improve our designs.”
Saenz credits those early hands-on experiences for giving him a head start.
“It taught me a lot of concepts that weren’t supposed to be learned until college,” he said.
Armed with that knowledge, Saenz graduated from New Mexico State University in 2019 with a dual degree in mechanical and aerospace engineering.
Now 28 years old, Saenz is already an accomplished professional. He adds White Sands to an impressive resume that includes past experiences with Albuquerque-based global manufacturing company Jabil and Kirtland Airforce Base.
Though only five months into the job, Saenz’s future at White Sands was set into motion more than a decade ago when he took a field trip to the site with Wertz in 2013.
“The kind invitations to present at White Sands or to take a tour of the facility has inspired many of the students to pursue degrees in engineering and STEM,” Wertz said. “The partnership continues to allow students to see the opportunities that are available for them if they are willing to put in the work.”
In a full-circle moment, Saenz and Mr. Wertz recently found themselves together at White Sands once again for the 2024 Environmental, Innovation, Safety, and Health Day event. This time not as student and teacher, but as industry colleagues in a reunion that could not have been better engineered.
David Wertz and Angel Saenz attend White Sand’s Environmental, Innovation, Safety, and Health Day event on October 31, 2024. The 2025 FIRST Robotics World Competition will take place in Houston at the George R. Brown Convention Center from April 16 to April 19. NASA will host an exciting robotics exhibit at the event, showcasing the future of technology and spaceflight. As many as 60,000 energetic fans, students, and industry leaders are expected to attend. Read more about NASA’s involvement with FIRST Robotics here.
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By NASA
Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio Mosaics More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 3 min read
Sols 4479-4480: What IS That Lumpy, Bumpy Rock?
NASA’s Mars rover Curiosity acquired this image of its workspace, including two rocks in front of it with interesting textures, different from anything seen before in the mission. The rover took the image with its Left Navigation Camera on March 12, 2025 — sol 4478, or Martian day 4,478 of the Mars Science Laboratory mission — at 07:00:42 UTC. NASA/JPL-Caltech Written by Ashley Stroupe, Mission Operations Engineer at NASA’s Jet Propulsion Laboratory
Earth planning date: Wednesday, March 12, 2025
The days are getting shorter and colder for Curiosity as we head into winter. So our rover is sleeping in a bit before waking up to a busy plan. Today I served as the Engineering Uplink Lead, managing the engineering side of the plan to support all the science activities.
We are seeing a lot of rocks with different, interesting textures, so Curiosity’s day begins with a lot of targeted imaging of this interesting area. The two rocks right in front of us (see image above) are different from anything that we have looked at before on the mission, so we are eager to know what they are. We are taking Mastcam images of “Manzana Creek” and “Palo Comado,” two of these interestingly textured rocks, and also of an area named “Vincent Gap,” where the rover disturbed some bedrock and exposed some regolith by driving over it in the prior plan. ChemCam is making a LIBS observation of a target called “Sturtevant Falls,” which is a nodule on the left-hand block in our workspace (on which we are later doing some contact science). ChemCam is also taking a long-distance RMI image in the direction of the potential boxworks formation (large veins), which is an area we will be exploring close-up in the future. There are also a Navcam dust devil movie and suprahorzion movie. Check out this article from November for more information on the boxwork formations.
After a nap, Curiosity wakes up to get in her arm exercise. I do not envy the Arm Rover Planner today (OK, maybe a little bit) in dealing with this very challenging workspace. The rock of interest (the left-hand rock in the above image) has jagged, vertical surfaces and a lot of crazy rough texture. Examining this rock is even more challenging because our primary targets are on the left side of the rock, rather than the side that is facing the rover. We are looking at two different targets, “Stunt Ranch,” which is a nodule on the rock, and “Pacifico Mountain,” which is the left-side face of the rock, with MAHLI and also doing a long APXS integration on Stunt Ranch. After the arm work, Curiosity is tucking herself in for the night by stowing the arm.
The next morning, after again getting to sleep in a bit, Curiosity will make some more targeted observations, starting with another dust-devil survey. ChemCam will make a LIBS observation of “Switzer Falls,” which is a target on the right-hand rock in the workspace (and in the image), an RMI of “Colby Canyon,” a soft sediment deformation, and “Gould,” which is another target on the boxworks formation. Lastly, Mastcam takes a look at “Potrero John,” yet another interestingly textured rock.
Curiosity will then be ready to drive away. Today’s drive is on slightly better terrain that we have been seeing recently, with fewer large and pointy rocks. Though, the mobility rover planners still have to be careful about picking the safest path through. We’re heading about 25 meters (about 82 feet) to another rock target named “Humber Park,” where we hope to do additional contact science. After the drive, we have our standard set of post-drive imaging, a Mastcam solar tau, and then an early-morning Navcam cloud observation.
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Last Updated Mar 14, 2025 Related Terms
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Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio Mosaics More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 5 min read
Sols 4473-4474: So Many Rocks, So Many Textures!
NASA’s Mars rover Curiosity acquired this image using its Chemistry & Camera (ChemCam) of a boulder about 40 meters (about 131 feet) away from the rover at the time. Curiosity acquired the image, showing the variety of structures and textures around the rover, on March 5, 2025 — sol 4471, or Martian day 4,471 of the Mars Science Laboratory mission — at 01:47:03 UTC. NASA/JPL-Caltech/LANL Written by Susanne Schwenzer, Planetary Geologist at The Open University
Earth planning date: Wednesday, March 5, 2025
The Martian landscape never ceases to amaze me, there is so much variation in texture and color! As a mineralogist, I marvel at them, but my colleagues trained in sedimentology regularly teach me how to see even more than the beauty of them: they can discern whether the materials that make up a rock were transported and laid down by the action of water or wind. The image above shows a rather unusual texture alongside more normal-looking laminated rocks. Just compare the small, brighter block in the foreground with the darker bigger rock in the center of the image. How should we interpret it? Well, that jury is still out. Are they sedimentary textures formed when the rock first was laid down, or shortly after, or are they textures that formed much later when water entered the rock and formed new minerals in the already existing rock? The latter would be more my area of research, and they are often called concretions. And I vividly remember the first concretions a rover ever found, the “blueberries.” Curiosity, of course, found many concretions, too. There is an interesting comparison between rocks that the Mars Exploration rover Opportunity found, and the one that Curiosity found very early in the mission, back at Yellowknife Bay. We have seen many more since, and the above might be another example.
The landscape directly around the rover today also has some interesting textures and, most important, some more regular-looking bedrock targets. Bedrock is what the team perceives to be the rocks that make up the part of the hill we are driving through. The dark blocks, like the one above, that are also strewn occasionally in the path of the rover are called float rocks, and we always look higher up into the hills to find out where they might have come from. As interesting as all those blocks and boulders are, they pose a huge challenge for the rover drivers. Today, they had managed to get us all the way to the intended stopping point, which in itself is a huge achievement. A mixture of large rocks and sand is just not conducive to any form of travel, and I always wonder how tiring it would be to just walk through the area. But we made it to the intended stopping point, driving just under 20 meters (about 65 feet), as intended. Unfortunately though, one of the rover’s wheels was perched on a rock in ways that posed a risk of dropping off that rock during an arm move. So, as is usual in those cases, we accept that contact science is not possible. The risk would just be too great that the rover moves just at the wrong moment and the arm bumps into the rock that an instrument is investigating at that moment. So, safety first, we decided to keep the arm tucked in and focus on remote science.
The team quickly pivoted to add some remote science to the already existing observations. As you might imagine in a terrain as interesting as this, Mastcam did get a workout. There are seven different observations in the plan! It looks into the distance to the Texoli Butte we are observing as we drive along it, and at a target, “Brown Mountain.” Looking into the many different features are also imaging activities on the targets “Placerita Canyon,” “Humber Park,” and two others just named “trough,” which is a descriptive term for little trough features the team is tracking for a while with the quest to better understand their formation. ChemCam has a LIBS investigation on target “Inspiration Point,” and two long-distance RMI (Remote Micro Imager) observations. One is truly at a long distance on Gould Mesa, another of the mounts we are observing as we go along. There is another RMI activity closer to the rover, to investigate more of those very interesting structures.
We also have environmental observations in the plan, observing the opacity of the atmosphere and of REMS investigations are occurring throughout the plan. REMS is our “weather station” measuring atmospheric pressure, temperature, humidity, winds, and ultraviolet radiation levels. DAN looks at the surface to measure the water and chlorine content in the rocks that the rover traverses over and RAD is looking up to the sky to measure the radiation that reaches the Martian surface. We do not often mention those in our blocks, because we are so used to seeing them there every single sol, doing their job, quietly in the background.
With so much to do, the only remaining question was where to drive. That was discussed at length, weighing the different science reasons to go to places along the path, and after much deliberation we decided to go to one of the float rocks, but reserve the option to make a right turn in the next plan, to get to another interesting place. All those discussions are so important to make sure we are making the most of the power we have at this cold time of the year, and getting all the science we can get. I am excited to see the data from today’s plan… and to find out where we end up. Not with a wheel on a rock, please, Mars — that would be a good start. But if we do, I am absolutely confident there will be lots to investigate anyway!
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Last Updated Mar 06, 2025 Related Terms
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