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NASA’s Perseverance Rover Scientists Find Intriguing Mars Rock


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Preparations for Next Moonwalk Simulations Underway (and Underwater)

The six-wheeled geologist found a fascinating rock that has some indications it may have hosted microbial life billions of years ago, but further research is needed.

A vein-filled rock is catching the eye of the science team of NASA’s Perseverance rover. Nicknamed “Cheyava Falls” by the team, the arrowhead-shaped rock contains fascinating traits that may bear on the question of whether Mars was home to microscopic life in the distant past.

Analysis by instruments aboard the rover indicates the rock possesses qualities that fit the definition of a possible indicator of ancient life. The rock exhibits chemical signatures and structures that could possibly have been formed by life billions of years ago when the area being explored by the rover contained running water. Other explanations for the observed features are being considered by the science team, and future research steps will be required to determine whether ancient life is a valid explanation.

The rockthe rover’s 22nd rock core samplewas collected on July 21, as the rover explored the northern edge of Neretva Vallis, an ancient river valley measuring a quarter-mile (400 meters) wide that was carved by water rushing into Jezero Crater long ago.

“We have designed the route for Perseverance to ensure that it goes to areas with the potential for interesting scientific samples,” said Nicola Fox, associate administrator, Science Mission Directorate at NASA Headquarters in Washington. “This trip through the Neretva Vallis riverbed paid off as we found something we’ve never seen before, which will give our scientists so much to study.”

Multiple scans of Cheyava Falls by the rover’s SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals) instrument indicate it contains organic compounds. While such carbon-based molecules are considered the building blocks of life, they also can be formed by non-biological processes.

“Cheyava Falls is the most puzzling, complex, and potentially important rock yet investigated by Perseverance,” said Ken Farley,Perseverance project scientist of Caltech in Pasadena. “On the one hand, we have our first compelling detection of organic material, distinctive colorful spots indicative of chemical reactions that microbial life could use as an energy source, and clear evidence that water — necessary for life — once passed through the rock. On the other hand, we have been unable to determine exactly how the rock formed and to what extent nearby rocks may have heated Cheyava Falls and contributed to these features.”

Perseverance views a 360 degree perspective of Bright Angel
NASA’s Perseverance rover used its Mastcam-Z instrument to capture this 360-degree panorama of a region on Mars called “Bright Angel,” where an ancient river flowed billions of years ago. “Cheyava Falls” was discovered in the area slightly right of center, about 361 feet (110 meters) from the rover.
NASA/JPL-Caltech/ASU/MSSS

Other details about the rock, which measures 3.2 feet by 2 feet (1 meter by 0.6 meters) and was named after a Grand Canyon waterfall, have intrigued the team, as well.

How Rocks Get Their Spots

In its search for signs of ancient microbial life, the Perseverance mission has focused on rocks that may have been created or modified long ago by the presence of water. That’s why the team homed in on Cheyava Falls.

“This is the kind of key observation that SHERLOC was built for — to seek organic matter as it is an essential component of a search for past life,” said SHERLOC’s principal investigator Kevin Hand of NASA’s Jet Propulsion Laboratory in Southern California, which manages the mission.

Running the length of the rock are large white calcium sulfate veins. Between those veins are bands of material whose reddish color suggests the presence of hematite, one of the minerals that gives Mars its distinctive rusty hue.

When Perseverance took a closer look at these red regions, it found dozens of irregularly shaped, millimeter-size off-white splotches, each ringed with black material, akin to leopard spots. Perseverance’s PIXL (Planetary Instrument for X-ray Lithochemistry) instrument has determined these black halos contain both iron and phosphate.

graphic, astrobiologists catalog a seven-step scale,
As shown in this graphic, astrobiologists catalog a seven-step scale, called the CoLD (Confidence of Life Detection) scale, to research whether a sample could indicate life. This “Cheyava Falls” sample is an example of Step One: “Detect possible signal.” Much additional research must be conducted to learn more.
NASA/Aaron Gronstal

“These spots are a big surprise,” said David Flannery, an astrobiologist and member of the Perseverance science team from the Queensland University of Technology in Australia. “On Earth, these types of features in rocks are often associated with the fossilized record of microbes living in the subsurface.”

Spotting of this type on sedimentary terrestrial rocks can occur when chemical reactions involving hematite turn the rock from red to white. Those reactions can also release iron and phosphate, possibly causing the black halos to form. Reactions of this type can be an energy source for microbes, explaining the association between such features and microbes in a terrestrial setting.

In one scenario the Perseverance science team is considering, Cheyava Falls was initially deposited as mud with organic compounds mixed in that eventually cemented into rock. Later, a second episode of fluid flow penetrated fissures in the rock, enabling mineral deposits that created the large white calcium sulfate veins seen today and resulting in the spots.

Another Puzzle Piece

While both the organic matter and the leopard spots are of great interest, they aren’t the only aspects of the Cheyava Falls rock confounding the science team. They were surprised to find that these veins are filled with millimeter-size crystals of olivine, a mineral that forms from magma. The olivine might be related to rocks that were formed farther up the rim of the river valley and that may have been produced by crystallization of magma.

If so, the team has another question to answer: Could the olivine and sulfate have been introduced to the rock at uninhabitably high temperatures, creating an abiotic chemical reaction that resulted in the leopard spots?

“We have zapped that rock with lasers and X-rays and imaged it literally day and night from just about every angle imaginable,” said Farley. “Scientifically, Perseverance has nothing more to give. To fully understand what really happened in that Martian river valley at Jezero Crater billions of years ago, we’d want to bring the Cheyava Falls sample back to Earth, so it can be studied with the powerful instruments available in laboratories.”

More Mission Information

A key objective of Perseverance’s mission on Mars is astrobiology, including caching samples that may contain signs of ancient microbial life. The rover will characterize the planet’s geology and past climate, to help pave the way for human exploration of the Red Planet and as the first mission to collect and cache Martian rock and regolith.

NASA’s Mars Sample Return Program, in cooperation with ESA (European Space Agency), is designed to send spacecraft to Mars to collect these sealed samples from the surface and return them to Earth for in-depth analysis.

The Mars 2020 Perseverance mission is part of NASA’s Moon to Mars exploration approach, which includes Artemis missions to the Moon that will help prepare for human exploration of the Red Planet.

NASA’s Jet Propulsion Laboratory, which is managed for the agency by Caltech, built and manages operations of the Perseverance rover.

For more about Perseverance:

science.nasa.gov/mission/mars-2020-perseverance

News Media Contacts

DC Agle
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-9011
agle@jpl.nasa.gov

Karen Fox / Erin Morton
Headquarters, Washington
202-358-1600 / 202-805-9393
karen.c.fox@nasa.gov / erin.morton@nasa.gov

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      Sols 4529-4531: Honeycombs and Waffles… on Mars!
      NASA’s Mars rover Curiosity captured this image of its current workspace, containing well-preserved polygonal shaped fractures, with waffle or honeycomb patterns. The rover acquired this image using its Front Hazard Avoidance Camera (Front Hazcam) on May 1, 2025 — Sol 4527, or Martian day 4,527 of the Mars Science Laboratory mission — at 16:41:35 UTC. NASA/JPL-Caltech Written by Catherine O’Connell-Cooper, Planetary Geologist at University of New Brunswick
      Earth planning date: Friday, May 2, 2025
      From our Wednesday stopping spot, the drive direction ahead (looking along the path we would follow in the Wednesday drive) appeared to be full of rough, gnarly material, which can be tricky targets for contact science instruments like APXS. However, coming into planning this morning, we found a workspace with amazingly well preserved polygonal shaped fractures, with raised ridges (about 1 centimeter, or about 0.39 inches, high), looking like a patchwork of honeycombs, or maybe a patch of waffles. We have spotted these before but usually not as well preserved and extensive as this — we can see these stretching away into the distance for 20-30 meters (about 66-98 feet), almost to the edge of the “boxwork” fracture structures at “Ghost Mountain” butte in this Navcam image. We are all counting down the drives to get to the boxwork structures — this will be such an exciting campaign to be part of.
      As APXS operations planner today, I was really interested to see if we could get APXS close to one of the raised ridges, to determine what they are made of. The Rover Planners were able to get a paired set of targets — “Orosco Ridge” along a ridge and “Box Canyon” in the adjacent, flat center of the polygon. The ChemCam team is also interested (in truth, everyone on the team is interested!!) in the composition of the ridges. So ChemCam will use LIBS to measure both bedrock and ridge fill at “Kitchen Creek” on the first sol of the plan and “Storm Canyon” on the second sol.  
      The “problem” with a workspace like this is picking which images to take in our short time here, before we drive on the second sol. We could stay here for a week and still find things to look at in this workspace. After much discussion, it was decided that MAHLI should focus on a “dog’s eye” mosaic (“Valley of the Moon”) along the vertical face of the large block. We hope this will allow us to examine how the fractures interact with each other, and with the preexisting layering in the bedrock.  
      Mastcam will then focus on the two main blocks in the workspace in an 8×4 (4 rows of 8 images) Kitchen Creek mosaic, which also encompasses the LIBS target of the same name, and a single image on the Storm Canyon LIBS target. Three smaller mosaics at “Green Valley Falls” (3×1), “Lost Palms Canyon” (7×2) and “San Andreas Fault” (1×2) will examine the relationships between the polygonal features and other fractures in the workspace, close to the rover. 
      Further afield, ChemCam will turn the “LD RMI” (Long-Distance Remote Micro Imager) on “Texoli” butte (the large butte to the side of the rover, visible in this image from sol 4528). Both Mastcam and ChemCam will image the boxwork fracture system near Ghost Mountain — they are so close now, it’s just a few drives away! Any information we get now may be able to help us answer some of the questions we have on the origin and timing of the boxwork structures, especially when we can combine it with the in situ analysis we will be getting shortly! (Did I mention how excited we all are about this campaign?)With all the excitement today on the wild fracture structures, it could be easy to overlook Curiosity’s dataset of environmental and atmospheric data. For more than 12 years now, we have been collecting information on dust and argon levels in the atmosphere, water and chlorine levels in the subsurface, wind speeds, humidity, temperature, ultraviolet radiation, pressure, and capturing movies and images of dust devils. This weekend is no different, adding a full complement of activities from almost every team — Navcam, REMS, DAN, Mastcam, ChemCam, and APXS will all collect data for the environmental and atmospheric theme group (ENV) in this plan.
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