NASA’s Curiosity Rover Unearths Mars’ Ancient Water Secrets

NASA Curiosity Mars Rover

Curiosity’s exploration of the Gediz Vallis channel on Mars offers new insights into the planet’s past, revealing a potential history of water flows and climatic changes that challenge previous beliefs about Mars’ aridity. Credit: NASA/JPL-Caltech/MSSS

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.

Curiosity Arrives at Gediz Vallis Channel

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 February 3. The formation has scientists intrigued because of what it might tell them about the history of water on the Red Planet. 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.

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

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.

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.

NASA Curiosity Mars Rover Path to 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. Credit: NASA/JPL-Caltech/UC Berkeley

“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.

3 Comments on "NASA’s Curiosity Rover Unearths Mars’ Ancient Water Secrets"

  1. Hello to all involved with this exploration starting from lift off and offering NASA information if water was once on the planet Mars. First and foremost, thank you to all the smart people working with the Rover on Mars. My Question… when will be the earliest possible trip for scientists to make the 3 year mission to the red planet and how many scientists will be making the journey? My understanding is all who go will have to give up around 10 of their earthly years for time up and time back as well as time to study? Thank you for answering my questions and your time. ❤️🙏🏻👍🏻GOD BLESS ALL ASTRONAUTS AND ALL WHO HAS HAD A HAND IN GETTING MARS ROVER TO MARS SAFELY SO ALL OF EARTH CAN LEARN ALL ABOUT MARS. Also, I hope a teacher gets to attend the trip to Mars as well as a reminder of the teacher who didn’t get the chance to which was Crista Mcauliffe who died on Challenger January 28th, 1986 73 seconds after takeoff. Also, crew members, Dick Scobee, Mike Smith, Ronald McNair, Ellison Onizuka, Judith Resnik and Gregory Jarvis. God continue to rest all their souls as well as all others who gave the ultimate sacrifice to the exploration of our planets. 37 years 2 months and 4 days as of this acknowledgement, Monday April 1st 2024.❤️❤️❤️❤️❤️❤️❤️🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻😇😇😇😇😇😇😇🥹🥹🥹🥹🥹🥹🥹😘😘😘😘😘😘😘

  2. Wait, un-“Earths”? On Mars?

  3. How poignant and thoughtful. Bless you Larry 👍

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