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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 3 min read
Curiosity Blog, Sols 4655-4660: Boxworks With a View
NASA’s Mars rover Curiosity acquired this image, showing the boxwork terrain in the foreground and the bright wind-sculpted material in the distance, on Sept. 12, 2025. Curiosity used its Right Navigation Camera on Sol 4657, or Martian day 4,657 of the Mars Science Laboratory mission, at 00:50:58 UTC. NASA/JPL-Caltech Written by Sharon Wilson Purdy, Planetary Geologist at the Smithsonian National Air and Space Museum
Earth planning date: Friday Sept. 12, 2025
Curiosity continues to image, analyze, and traverse through a landscape characterized by higher standing ridges separating low-lying depressions (hollows) — a surface known as the boxwork terrain on Mount Sharp. The science team is actively characterizing the texture, chemistry, and mineralogy of the ridges and hollows to understand how this surface formed and changed over time. I served as the Geology theme group “Keeper of the Plan” for Sols 4656-4657 where I compiled the details for each scientific activity that will be carried out by the rover. I selected the particular Navcam image accompanying this blog post because it not only shows the intriguing boxwork terrain beneath our wheels but also highlights the striking wind-sculpted yardangs on our exciting route ahead.
Our successful drive over the weekend set us up nicely to investigate the bedrock ridge in the workspace directly in front of the rover on Sol 4655. The target “Chango” was selected for closer inspection with the dust removal tool (DRT) and APXS and MAHLI instruments. ChemCam used its LIBS instrument to analyze the chemistry of a bedrock ridge at the “Quechua” target, and Mastcam and ChemCam included several mosaics to document walls of nearby hollow interiors, fractures, and the hollow-to-ridge transitions.
The plan for Sols 4656-4657 focused on a variety of remote sensing activities including a 360-degree mosaic by Mastcam — one of the most spectacular data products! ChemCam investigated the local bedrock and a raised resistant bedrock feature at “Chita” and “Chaco,” respectively, and then turned its sights to the distant floor of Gale crater to image features that may have formed when water eroded material from the interior walls of the crater rim.
Planning on Friday for Sols 4658-4660 included three targeted science blocks to dig deeper into the boxwork unit. ChemCam LIBS will analyze the bedrock at targets “Tarata” and “El Sombrio” and a rock that does not look like typical bedrock at “Cobres.” The Mastcam team assembled multiple images and mosaics that will help decipher the distribution of veins, fractures, and nodules (somewhat rounded features) in the bedrock, as well as small sand dunes in and around the workspace. The environmental theme group worked throughout the week to monitor clouds and dust-devil activity, and planned Mastcam tau observations to assess the optical depth of the atmosphere and constrain aerosol scattering properties.
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Last Updated Sep 15, 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 2 min read
Curiosity Blog, Sols 4649-4654: Ridges, Hollows and Nodules, Oh My
NASA’s Mars rover Curiosity acquired this image using its Left Navigation Camera, showing the transition from smoother ridge bedrock (right) to more nodular bedrock (bottom left to top middle) on the edge of a shallow hollow (top left). Curiosity, whose masthead shadow is also visible, captured this image on Sept. 5, 2025 — Sol 4650, or Martian day 4,650 of the Mars Science Laboratory mission — at 00:22:34 UTC. NASA/JPL-Caltech Written by Lucy Thompson, Planetary Scientist and APXS Team Member, University of New Brunswick, Canada
Earth planning date: Friday, Sept. 5, 2025
Curiosity is in the midst of the boxwork campaign, trying to decipher why we see such pronounced ridges and hollows in this area of Mount Sharp. When this terrain was first identified from orbit it was hypothesized that the ridges may be the result of cementation by circulating fluids, followed by differential erosion of the less resistant bedrock in between (the hollows that we now observe).
We have been exploring the boxwork terrain documenting textures, structures and composition to investigate potential differences between ridges and hollows. One of the textural features we have observed are nodules in varying abundance. The focus of our activities this week was to document the transition from smoother bedrock atop a boxwork ridge to more nodular bedrock associated with the edge of a shallow hollow.
In Tuesday’s three-sol plan we analyzed the smoother bedrock within the ridge, documenting textures with MAHLI, Mastcam, and ChemCam RMI, and chemistry with ChemCam LIBS and APXS. Curiosity then successfully bumped towards the edge of the ridge/hollow to place the more nodular bedrock in our workspace. Friday’s three-sol plan was basically a repeat of the previous observations, but this time focused on the more nodular bedrock. The planned drive should take us to another boxwork ridge, and closer to the area where we plan to drill into one of the ridges.
As the APXS strategic planner this week, I helped to select the rock targets for analysis by our instrument, ensuring they were safe to touch and that they met the science intent of the boxwork campaign. I also communicated to the rest of the team the most recent results from our APXS compositional analyses and how they fit into our investigation of the boxwork terrain. This will help to inform our fast-approaching decision about where to drill.
Both plans included Mastcam and ChemCam long-distance RMI imaging of more distant features, including other boxwork ridges and hollows, buttes, the yardang unit, and Gale crater rim. Planned environmental activities continue to monitor dust in the atmosphere, dust-devil activity, and clouds. Standard REMS, RAD, and DAN activities round out the week’s activities.
Want to read more posts from the Curiosity team?
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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 4 min read
Curiosity Blog, Sols 4641-4648: Thinking Outside and Inside the ‘Boxwork’
NASA’s Mars rover Curiosity acquired this image using its Left Navigation Camera on Aug. 28, 2025 — Sol 4643, or Martian day 4,643 of the Mars Science Laboratory mission — at 20:45:52 UTC. NASA/JPL-Caltech Written by Ashley Stroupe, Mission Operations Engineer and Rover Planner at NASA’s Jet Propulsion Laboratory
Earth planning week: Aug. 25, 2025.
This week Curiosity has been exploring the boxwork unit, investigating both the ridges and the hollows to better characterize them and understand how they may have formed. We’ve been doing lots of remote science, contact science, and driving in each plan. In addition, we have our standard daily environmental observations to look at dust in the atmosphere. We can still see distant targets like the crater rim, but temperatures will soon begin to warm up as we start moving into a dustier part of the year. And after each drive, we also use AEGIS to do some autonomous target selection for ChemCam observations. I was the arm rover planner for the 4645-4648 plan on Friday.
For Monday’s plan (sols 4641-4642), after a successful weekend drive Curiosity began on the edge of a boxwork ridge. We did a lot of imaging, including Mastcam mosaics of “El Alto,” an upturned rock near a wheel, the ridge forming the south side of the Mojo hollow, “Sauces,” our contact science target, and “Navidad,” an extension of our current workspace. We also took ChemCam LIBS of Sauces and an RMI mosaic. The rover planners did not find any bedrock large enough to brush, but did MAHLI and APXS on Sauces. Ready to drive, Curiosity drove about 15 meters (about 49 feet) around the ridge to the south and into the next hollow, named “Mojo.”
In Wednesday’s plan (sols 4643-4644), Curiosity was successfully parked in the Mojo hollow. We started with a lot of imaging, including Mastcam mosaics of the ridges around the Mojo hollow, a nearby trough and the hollow floor to look for regolith movement. We also imaged a fractured float rock named “La Laguna Verde.” ChemCam planned a LIBS target on “Corani,” a thin resistant clast sticking out of the regolith, a RMI mosaic of a target on the north ridge named “Cocotoni,” and a long-distance RMI mosaic of “Babati Mons,” a mound about 100 kilometers (about 62 miles) away that we can see peeking over the rim of Gale crater! With no bedrock in the workspace, the rover planners did MAHLI and APXS observations on a regolith target named “Tarapacá.” The 12-meter drive in this plan (about 39 feet) was challenging; driving out of the hollow and up onto the ridge required the rover to overcome tilts above 20 degrees, where the rover can experience a lot of slip. Also, with the drive late in the day, it was challenging to determine where Curiosity should be looking to track her slip using Visual Odometry without getting blinded by the sun or losing features in shadows. Making sure VO works well is particularly important on drives like this when we expect a lot of slip.
Friday’s plan, like most weekend plans, was more complex — particularly because this four-sol plan also covers the Labor Day holiday on Monday. Fortunately, the Wednesday drive was successful, and we reached the desired parking location on the ridge south of Mojo for imaging and contact science. The included image looks back over the rover’s shoulder, where we can see the ridge and hollow. We took a lot of imaging looking at hollows and the associated ridges. We are taking a Mastcam mosaic of “Jorginho Cove,” a target covering the ridge we are parked on and the next hollow to the south, “Pica,” a float rock that is grayish in color, and a ridge/hollow pair named “Laguna Colorada.” We also take ChemCam LIBS observations of Pica and two light-toned pieces of bedrock named “Tin Tin” and ”Olca.” ChemCam takes RMI observations of “Briones,” which is a channel on the crater rim, “La Serena,” some linear features in the crater wall, and a channel that feeds into the Peace Vallis fan.
After a week of fairly simple arm targets, the rover planners had a real challenge with this workspace. The rocks were mostly too small and too rough to brush, but we did find one spot after a lot of looking. We did DRT, APXS, and MAHLI on this spot, named “San Jose,” and also did MAHLI and APXS on another rock named “Malla Qullu.” This last drive of the week is about 15 meters (about 49 feet) following along a ridge and then driving onto a nearby one.
Want to read more posts from the Curiosity team?
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Advancing Single-Photon Sensing Image Sensors to Enable the Search for Life Beyond Earth
A NASA-sponsored team is advancing single-photon sensing Complementary Metal-Oxide-Semiconductor (CMOS) detector technology that will enable future NASA astrophysics space missions to search for life on other planets. As part of their detector maturation program, the team is characterizing sensors before, during, and after high-energy radiation exposure; developing novel readout modes to mitigate radiation-induced damage; and simulating a near-infrared CMOS pixel prototype capable of detecting individual photons.
Single-photon sensing and photon-number resolving CMOS image sensors: a 9.4 Mpixel sensor (left) and a 16.7 Mpixel sensor (right). Credit: CfD, RIT Are we alone in the universe? This age-old question has inspired scientific exploration for centuries. If life on other planets evolves similarly to life on Earth, it can imprint its presence in atmospheric spectral features known asbiosignatures. They include absorption and emission lines in the spectrum produced by oxygen, carbon dioxide, methane, and other molecules that could indicate conditions which can support life. A future NASA astrophysics mission, the Habitable Worlds Observatory (HWO), will seek to find biosignatures in the ultraviolet, optical, and near-infrared (NIR) spectra of exoplanet atmospheres to look for evidence that life may exist elsewhere in the universe.
HWO will need highly sensitive detector technology to detect these faint biosignatures on distant exoplanets. The Single-Photon Sensing Complementary Metal-Oxide-Semiconductor (SPSCMOS) image sensor is a promising technology for this application. These silicon-based sensors can detect and resolve individual optical-wavelength photons using a low-capacitance, high-gain floating diffusion sense node. They operate effectively over a broad temperature range, including at room temperature. They have near-zero read noise, are tolerant to radiation, and generate very little unwanted signal—such as dark current. When cooled to 250 K, the dark current drops to just one electron every half-hour. If either the read noise or dark current is too high, the sensor will fail to detect the faint signals that biosignatures produce.
A research team at the Rochester Institute of Technology (RIT) Center for Detectors (CfD) is accelerating the readiness of these SPSCMOS sensors for use in space missions through detector technology maturation programs funded by NASA’s Strategic Astrophysics Technology and Early Stage Innovations solicitations. These development programs include several key goals:
Characterize critical detector performance metrics like dark current, quantum efficiency, and read noise before, during, and after exposure to high-energy radiation Develop new readout modes for these sensors to mitigate effects from short-term and long-term radiation damage Design a new NIR version of the sensor using Technology Computer-Aided Design (TCAD) software SPSCMOS sensors operate similarly to traditional CMOS image sensors but are optimized to detect individual photons—an essential capability for ultra-sensitive space-based observations, such as measuring the gases in the atmospheres of exoplanets. Incoming photons enter the sensor and generate free charges (electrons) in the sensor material. These charges collect in a pixel’s storage well and eventually transfer to a low-capacitance component called the floating diffusion (FD) sense node where each free charge causes a large and resolved voltage shift. This voltage shift is then digitized to read the signal.
Experiments that measure sensor performance in a space relevant environment use a vacuum Dewar and a thermally-controlled mount to allow precise tuning of the sensors temperature. The Dewar enables testing at conditions that match the expected thermal environment of the HWO instrument, and can even cool the sensor and its on-chip circuits to temperatures colder than any prior testing reported for this detector family. These tests are critical for revealing performance limitations with respect to detector metrics like dark current, quantum efficiency, and read noise. As temperatures change, the electrical properties of on-chip circuits can also change, which affects the read out of charge in a pixel.
The two figures show results for SPSCMOS devices. The figure on the left shows a photon counting histogram with peaks that correspond to photon number. The figure on the right shows the dark current for a SPSCMOS device before and after exposure to 50 krad of 60 MeV protons. Credit: CfD, RIT The radiation-rich environment for HWO will cause temporary and permanent effects in the sensor. These effects can corrupt the signal measured in a pixel, interrupt sensor clocking and digital logic, and can cause cumulative damage that gradually degrades sensor performance. To mitigate the loss of detector sensitivity throughout a mission lifetime, the RIT team is developing new readout modes that are not available in commercial CMOS sensors. These custom modes sample the signal over time (a “ramp” acquisition) to enable the detection and removal of cosmic ray artifacts. In one mode, when the system identifies an artifact, it segments the signal ramp and selectively averages the segments to reconstruct the original signal—preserving scientific data that would otherwise be lost. In addition, a real-time data acquisition system monitors the detector’s power consumption, which may change from the accumulation of damage throughout a mission. The acquisition system records these shifts and communicates with the detector electronics to adjust voltages and maintain nominal operation. These radiation damage mitigation strategies will be evaluated during a number of test programs at ground-based radiation facilities. The tests will help identify unique failure mechanisms that impact SPSCMOS technology when it is exposed to radiation equivalent to the dose expected for HWO.
Custom acquisition electronics (left) that will control the sensors during radiation tests, and an image captured using this system (right). Credit: CfD, RIT While existing SPSCMOS sensors are limited to detecting visible light due to their silicon-based design, the RIT team is developing the world’s first NIR single-photon photodiode based on the architecture used in the optical sensors. The photodiode design starts as a simulation in TCAD software to model the optical and electrical properties of the low-capacitance CMOS architecture. The model simulates light-sensitive circuits using both silicon and Mercury Cadmium Telluride (HgCdTe or MCT) material to determine how well the pixel would measure photo-generated charge if a semiconductor foundry physically fabricated it. It has 2D and 3D device structures that convert light into electrical charge, and circuits to control charge transfer and signal readout with virtual probes that can measure current flow and electric potential. These simulations help to evaluate the key mechanisms like the conversion of light into electrons, storing and transferring the electrons, and the output voltage of the photodiode sampling circuit.
In addition to laboratory testing, the project includes performance evaluations at a ground-based telescope. These tests allow the sensor to observe astronomical targets that cannot be fully replicated in lab. Star fields and diffuse nebulae challenge the detector’s full signal chain under real sky backgrounds with faint flux levels, field-dependent aberrations, and varying seeing conditions. These observations help identify performance limitations that may not be apparent in controlled laboratory measurements.
In January 2025, a team of researchers led by PhD student Edwin Alexani used an SPSCMOS-based camera at the C.E.K. Mees Observatory in Ontario County, New York. They observed star cluster M36 to evaluate the sensor’s photometric precision, and the Bubble Nebula in a narrow-band H-alpha filter. The measured dark current and read noise were consistent with laboratory results.
The team observed photometric reference stars to estimate the quantum efficiency (QE) or the ability for the detector to convert photons into signal. The calculated QE agreed with laboratory measurements, despite differences in calibration methods.
The team also observed the satellite STARLINK-32727 as it passed through the telescope’s field of view and measured negligible persistent charge—residual signal that can remain in detector pixels after exposure to a bright source. Although the satellite briefly produced a bright streak across several pixels due to reflected sunlight, the average latent charge in affected pixels was only 0.03 e–/pix – well below both the sky-background and sensor’s read noise.
Images captured at the C.E.K. Mees Observatory. Left: The color image shows M36 in the Johnson color filters B (blue), V (green), and R (red) bands (left). Right: Edwin Alexani and the SPSCMOS camera (right). Credit: : CfD, RIT As NASA advances and matures the HWO mission, SPSCMOS technology promises to be a game-changer for exoplanet and general astrophysics research. These sensors will enhance our ability to detect and analyze distant worlds, bringing us one step closer to answering one of humanity’s most profound questions: are we alone?
For additional details, see the entry for this project on NASA TechPort.
Project Lead(s): Dr. Donald F. Figer, Future Photon Initiative and Center for Detectors, Rochester Institute of Technology (RIT), supported by engineer Justin Gallagher and a team of students.
Sponsoring Organization(s): NASA Astrophysics Division, Strategic Astrophysics Technology (SAT) Program and NASA Space Technology Mission Directorate (STMD), Early Stage Innovations (ESI) Program
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Last Updated Sep 02, 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 3 min read
Curiosity Blog, Sols 4638-4640: Imaging Extravaganza Atop a Ridge
NASA’s Mars rover Curiosity acquired this image on Aug. 21, 2025, looking across the ridge that the rover is currently parked near the edge of, looking down into the “Thumb” region that mission planners hope to be exploring next week. Curiosity captured this image using its Left Navigation Camera on Sol 4636, or Martian day 4,636 of the MArs Science Laboratory mission, at 16:09:13 UTC. NASA/JPL-Caltech Written by Conor Hayes, Graduate Student at York University
Earth planning date: Friday, Aug. 22, 2025
Curiosity is continuing its winding path through the mysterious boxwork structures that have been a major focus of the last several months of the mission. After driving away from “Río Frío,” we are now parked on top of a ridge overlooking a topographic depression that we’ve nicknamed the “Thumb.” The image on this post shows that ridge running along the “thumb’s” edge. Our goal today is to characterize this ridge before we drive down into the Thumb.
Because we had a lot of power and three sols available to play around with, this weekend plan is packed with a lot of good science. The boxwork structures in our immediate vicinity get a lot of attention, with Mastcam images planned of the targets “Wallatiri,” “Wallatiri 2,” “Mojo,” “Samaipata,” “Fort Samaipata,” and “Río Lluta,” as well as a nearby trough. ChemCam will be taking LIBS measurements of both Samaipata and Fort Saaipata as well. Samaipata gets even more attention from MAHLI, in addition to the targets “Vitichi” and “Tartagalita,” both of which will also be observed by APXS.
The boxwork structures don’t get all of the fun today, though. In addition to all of the boxwork observations, Mastcam will be documenting the ChemCam AEGIS target from Monday’s plan, and will also be doing some more imaging of the “Mishe Mokwa” butte. The highlight of Mastcam’s work in this plan (at least in my opinion) is the large 44-image mosaic of the north crater rim, taking advantage of the particularly low dust content of the atmosphere at this time of year. ChemCam will be taking several RMI images of Mishe Mokwa and a distant outcrop at “Dragones” that we will be driving towards over the next several months, as well as the usual post-drive AEGIS.
Rounding out this plan is a collection of observations of the atmosphere. In addition to typical DAN, REMS, and RAD activities, Curiosity’s Navcams will be put to work with a dust-devil movie, dust-devil survey, five cloud movies, and two line-of-sight observations of the north crater rim. Mastcam also gets involved in the environmental fun with a tau to track the amount of dust in the air.
Even with all of these activities, we decided that we aren’t yet done with this area. The drive in today’s plan is a short bump of about 2 meters (about 6.6 feet), so we’re all looking forward to continuing our investigation of this ridge on Monday.
Want to read more posts from the Curiosity team?
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