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NASA’s Curiosity Searches for New Clues About Mars’ Ancient Water


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NASA’s Curiosity Mars rover captured this 360-degree panorama
After arriving at Gediz Vallis channel, NASA’s Curiosity Mars rover captured this 360-degree panorama using one of its black-and-white navigation cameras on Feb. 3. The formation has scientists intrigued because of what it might tell them about the history of water on the Red Planet.
NASA/JPL-Caltech

The rover has arrived at an area that may show evidence liquid water flowed on this part of Mars for much longer than previously thought.

NASA’s Curiosity rover has begun exploring a new region of Mars, one that could reveal more about when liquid water disappeared once and for all from the Red Planet’s surface. Billions of years ago, Mars was much wetter and probably warmer than it is today. Curiosity is getting a new look into that more Earth-like past as it drives along and eventually crosses the Gediz Vallis channel, a winding, snake-like feature that – from space, at least – appears to have been carved by an ancient river.

That possibility has scientists intrigued. The rover team is searching for evidence that would confirm how the channel was carved into the underlying bedrock. The formation’s sides are steep enough that the team doesn’t think the channel was made by wind. However, debris flows (rapid, wet landslides) or a river carrying rocks and sediment could have had enough energy to chisel into the bedrock. After the channel formed, it was filled with boulders and other debris. Scientists are also eager to learn whether this material was transported by debris flows or dry avalanches.

Pan around inside this 360-degree video to see Gediz Vallis channel from the point of view of NASA’s Curiosity Mars rover.
Credit: NASA/JPL-Caltech

Since 2014, Curiosity has been ascending the foothills of Mount Sharp, which stands 3 miles (5 kilometers) above the floor of Gale Crater. The layers in this lower part of the mountain formed over millions of years amid a changing Martian climate, providing scientists with a way to study how the presence of both water and the chemical ingredients required for life changed over time.

For example, a lower part of those foothills included a layer rich in clay minerals where a lot of water once interacted with rock. Now the rover is exploring a layer enriched with sulfates – salty minerals that often form as water evaporates.

Revising Mount Sharp’s Timeline

It will take months to fully explore the channel, and what scientists learn could revise the timeline for the mountain’s formation.

This rendering shows the area where NASA’s Curiosity Mars rover climbed a steep slope to reach a location called Gediz Vallis channel
The steep path NASA’s Curiosity Mars rover took to reach Gediz Vallis channel is indicated in yellow in this visualization made with orbital data. At lower right is the point where the rover veered off to get an up-close look at a ridge formed long ago by debris flows from higher up on Mount Sharp.
NASA/JPL-Caltech/UC Berkeley

Once the sedimentary layers of lower Mount Sharp had been deposited by wind and water, erosion whittled them down to expose the layers visible today. Only after these lengthy processes – as well as intensely dry periods during which the surface of Mount Sharp was a sandy desert – could the Gediz Vallis channel have been carved.

Scientists think the boulders and other debris that subsequently filled the channel came from high up on the mountain, where Curiosity will never go, giving the team a glimpse of what kinds of material may be up there.

“If the channel or the debris pile were formed by liquid water, that’s really interesting. It would mean that fairly late in the story of Mount Sharp – after a long dry period – water came back, and in a big way,” said Curiosity’s project scientist, Ashwin Vasavada of NASA’s Jet Propulsion Laboratory in Southern California.

That explanation would be consistent with one of the most surprising discoveries Curiosity has made while driving up Mount Sharp: Water seems to have come and gone in phases, rather than gradually disappearing as the planet grew drier. These cycles can be seen in evidence of mud cracks; shallow, salty lakes; and, directly below the channel, cataclysmic debris flows that piled up to create the sprawling Gediz Vallis ridge.

Last year, Curiosity made a challenging ascent to study the ridge, which drapes across the slopes of Mount Sharp and seems to grow out of the end of the channel, suggesting both are part of one geologic system.

Viewing the Channel Up Close

Curiosity documented the channel with a 360-degree black-and-white panorama from the rover’s left navigation camera. Taken on Feb. 3 (the 4,086th Martian day, or sol, of the mission), the image shows the dark sand that fills one side of the channel and a debris pile rising just behind the sand. In the opposite direction is the steep slope that Curiosity climbed to reach this area.

The rover takes these kinds of panoramas with its navigation cameras at the end of each drive. Now the science team is relying on the navcams even more while engineers try to resolve an issue that is limiting the use of one imager belonging to the color Mast Camera, or Mastcam.

More About the Mission

Curiosity was built by JPL, which is managed by Caltech in Pasadena, California. JPL leads the mission on behalf of NASA’s Science Mission Directorate in Washington.

For more about Curiosity, visit:

https://mars.nasa.gov/msl

News Media Contacts

Andrew Good
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-2433
andrew.c.good@jpl.nasa.gov

Karen Fox / Alana Johnson
NASA Headquarters, Washington
301-286-6284 / 202-358-1501
karen.c.fox@nasa.gov / alana.r.johnson@nasa.gov

2024-034

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      On its recent swing by Mars, NASA’s Europa Clipper took the opportunity to capture infrared images of the Red Planet. The data will help mission scientists calibrate the spacecraft’s thermal imaging instrument so they can be sure it’s operating correctly when Europa Clipper arrives at the Jupiter system in 2030.
      The mission’s sights are set on Jupiter’s moon Europa and the global ocean hidden under its icy surface. A year after slipping into orbit around Jupiter, Europa Clipper will begin a series of 49 close flybys of the moon to investigate whether it holds conditions suitable for life.
      A key element of that investigation will be thermal imaging — global scans of Europa that map temperatures to shed light on how active the surface is. Infrared imaging will reveal how much heat is being emitted from the moon; warmer areas of the ice give off more energy and indicate recent activity.
      The imaging also will tell scientists where the ocean is closest to the surface. Europa is crisscrossed by dramatic ridges and fractures, which scientists believe are caused by ocean convection pulling apart the icy crust and water rising up to fill the gaps.
      This picture of Mars is a colorized composite of several images captured by Europa Clipper’s thermal imager. Warm colors represent relatively warm temperatures; red areas are about 32 degrees Fahrenheit (0 degrees Celsius), and purple regions are about minus 190 F (minus 125 C).NASA/JPL-Caltech/ASU “We want to measure the temperature of those features,” said Arizona State University’s Phil Christensen, principal investigator of Europa Clipper’s infrared camera, called the Europa Thermal Imaging System (E-THEMIS). “If Europa is a really active place, those fractures will be warmer than the surrounding ice where the ocean comes close to the surface. Or if water erupted onto the surface hundreds to thousands of years ago, then those surfaces could still be relatively warm.”
      Why Mars
      On March 1, Europa Clipper flew just 550 miles (884 kilometers) above the surface of Mars in order to use the planet’s gravitational pull to reshape the spacecraft’s trajectory. Ultimately, the assist will get the mission to Jupiter faster than if it made a beeline for the gas giant, but the flyby also offered a critical opportunity for Europa Clipper to test E-THEMIS.
      For about 18 minutes on March 1, the instrument captured one image per second, yielding more than a thousand grayscale pictures that were transmitted to Earth starting on May 5. After compiling these images into a global snapshot of Mars, scientists applied color, using hues with familiar associations: Warm areas are depicted in red, while colder areas are shown as blue.
      By comparing E-THEMIS images with those made from established Mars data, scientists can judge how well the instrument is working.
      “We wanted no surprises in these new images,” Christensen said. “The goal was to capture imagery of a planetary body we know extraordinarily well and make sure the dataset looks exactly the way it should, based on 20 years of instruments documenting Mars.”
      NASA’s Mars Odyssey orbiter, launched in 2001, carries a sister instrument named THEMIS that has been capturing its own thermal images of the Red Planet for decades. To be extra thorough, the Odyssey team collected thermal images of Mars before, during, and after Europa Clipper’s flyby so that Europa scientists can compare the visuals as an additional gauge of how well E-THEMIS is calibrated.
      Europa Clipper also took advantage of the close proximity to Mars to test all the components of its radar instrument in unison for the first time. The radar antennas and the wavelengths they produce are so long that it wasn’t possible for engineers to can do that in a clean room before launch. The radar data will be returned and analyzed in the coming weeks and months, but preliminary assessments of the real-time telemetry indicate that the test went well.
      To leverage the flyby even further, the science team took the opportunity to ensure that the spacecraft’s telecommunication equipment will be able to conduct gravity experiments at Europa. By transmitting signals to Earth while passing through Mars’ gravity field, they were able to confirm that a similar operation is expected to work at Europa.
      Europa Clipper launched from NASA’s Kennedy Space Center in Florida on Oct. 14, 2024, via a SpaceX Falcon Heavy, embarking on a 1.8 billion-mile (2.9 billion-kilometer) journey to Jupiter, which is five times farther from the Sun than Earth is. Now that the probe has harnessed the gravity of Mars, its next gravity assist will be from Earth in 2026.
      More About Europa Clipper
      Europa Clipper’s three main science objectives are to determine the thickness of the moon’s icy shell and its interactions with the ocean below, to investigate its composition, and to characterize its geology. The mission’s detailed exploration of Europa will help scientists better understand the astrobiological potential for habitable worlds beyond our planet.
      Managed by Caltech in Pasadena, California, NASA’s Jet Propulsion Laboratory in Southern California leads the development of the Europa Clipper mission in partnership with the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, for NASA’s Science Mission Directorate in Washington. APL designed the main spacecraft body in collaboration with JPL and NASA’s Goddard Space Flight Center in Greenbelt, Maryland, NASA’s Marshall Space Flight Center in Huntsville, Alabama, and Langley Research Center in Hampton, Virginia. The Planetary Missions Program Office at NASA Marshall executes program management of the Europa Clipper mission. NASA’s Launch Services Program, based at NASA Kennedy, managed the launch service for the Europa Clipper spacecraft.
      Find more information about Europa Clipper here:
      News Media Contacts
      Gretchen McCartney
      Jet Propulsion Laboratory, Pasadena, Calif.
      818-287-4115
      gretchen.p.mccartney@jpl.nasa.gov 
      Karen Fox / Molly Wasser
      NASA Headquarters, Washington
      202-358-1600
      karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov  
      2025-065
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      Last Updated May 12, 2025 Related Terms
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