A Mighty Martian River? Latest Astonishing Discovery by NASA’s Perseverance Mars Rover – SciTechDaily

Scientists think that these bands of rocks may have been formed by a very fast, deep river the first of its kind evidence has been found for on Mars. NASAs Perseverance Mars rover captured this scene at a location nicknamed Skrinkle Haven using its Mastcam-Z camera between February 28 and March 9, 2023. Credit: NASA/JPL-Caltech/ASU/MSSS

Evidence left in rocks is leading scientists to rethink what watery environments looked like on ancient Mars.

New images from NASAs Perseverance rover reveal evidence of a powerful river on Mars, possibly deeper and faster-moving than previously known. The images depict sedimentary rock layers with coarse sediment grains and cobbles, indicating a high-energy river system. Understanding these Martian watery environments is crucial for the search for ancient microbial life and expands our knowledge of Mars past.

New images taken by NASAs Perseverance rover may show signs of what was once a rollicking river on Mars, one that was deeper and faster-moving than scientists have ever seen evidence for in the past. The river was part of a network of waterways that flowed into Jezero Crater, the area the rover has been exploring since landing more than two years ago.

Understanding these watery environments could help scientists in their efforts to seek out signs of ancient microbial life that may have been preserved in Martian rock.

Perseverance is exploring the top of a fan-shaped pile of sedimentary rock that stands 820 feet (250 meters) tall and features curving layers suggestive of flowing water. One question scientists want to answer is whether that water flowed in relatively shallow streams closer to what NASAs Curiosity rover has found evidence of in Gale Crater or a more powerful river system.

This illustration depicts NASAs Perseverance rover operating on the surface of Mars. NASAs Perseverance rover has discovered potential evidence of a previously unknown, powerful river system on Mars. Images captured reveal coarse sediment grains and cobbles, suggesting a high-energy river once flowed into the Jezero Crater, which may hold clues to Mars ancient microbial life. Credit: NASA

Stitched together from hundreds of images captured by Perseverances Mastcam-Z instrument, two new mosaics suggest the latter, revealing important clues: coarse sediment grains and cobbles.

Those indicate a high-energy river thats truckin and carrying a lot of debris. The more powerful the flow of water, the more easily its able to move larger pieces of material, said Libby Ives, a postdoctoral researcher at NASAs Jet Propulsion Laboratory in Southern California, which operates the Perseverance rover. With a background in studying Earth-based rivers, Ives has spent the last six months analyzing images of the Red Planets surface. Its been a delight to look at rocks on another planet and see processes that are so familiar, Ives said.

Years ago, scientists noticed a series of curving bands of layered rock within Jezero Crater that they dubbed the curvilinear unit. They could see these layers from space but are finally able to see them up close, thanks to Perseverance.

One location within the curvilinear unit, nicknamed Skrinkle Haven, is captured in one of the new Mastcam-Z mosaics. Scientists are sure the curved layers here were formed by powerfully flowing water, but Mastcam-Zs detailed shots have left them debating what kind: a river such as the Mississippi, which winds snakelike across the landscape, or a braided river like Nebraskas Platte, which forms small islands of sediment called sandbars.

NASAs Perseverance Mars rover captured this mosaic of a hill nicknamed Pinestand. Scientists think the tall sedimentary layers stacked on top of one another here could have been formed by a deep, fast-moving river. Credit: NASA/JPL-Caltech/ASU/MSSS

When viewed from the ground, the curved layers appear arranged in rows that ripple out across the landscape. They could be the remnants of a rivers banks that shifted over time or the remnants of sandbars that formed in the river. The layers were likely much taller in the past. Scientists suspect that after these piles of sediment turned to rock, they were sandblasted by wind over the eons and carved down to their present size.

The wind has acted like a scalpel that has cut the tops off these deposits, said Michael Lamb of Caltech, a river specialist and Perseverance science team collaborator. We do see deposits like this on Earth, but theyre never as well exposed as they are here on Mars. Earth is covered in vegetation that hides these layers.

A second mosaic captured by Perseverance shows a separate location that is part of the curvilinear unit and about a quarter mile (450 meters) from Skrinkle Haven. Pinestand is an isolated hill bearing sedimentary layers that curve skyward, some as high as 66 feet (20 meters). Scientists think these tall layers may also have been formed by a powerful river, although theyre exploring other explanations, as well.

These layers are anomalously tall for rivers on Earth, Ives said. But at the same time, the most common way to create these kinds of landforms would be a river.

The team is continuing to study Mastcam-Zs images for additional clues. Theyre also peering below the surface, using the ground-penetrating radar instrument on Perseverance called RIMFAX (short for Radar Imager for Mars Subsurface Experiment). What they learn from both instruments will contribute to an ever-expanding body of knowledge about Mars ancient, watery past.

Whats exciting here is weve entered a new phase of Jezeros history. And its the first time were seeing environments like this on Mars, said Perseverances deputy project scientist, Katie Stack Morgan of JPL. Were thinking about rivers on a different scale than we have before.

Perseverances mission on Mars primarily focuses on astrobiology, particularly hunting for evidence of ancient microbial life. The rovers tasks also include analyzing the planets geology and historical climate, preparing for future human exploration, and pioneering the collection and storage of Martian rock and regolith (a mix of broken rock and dust).

Future NASA missions, in collaboration with the European Space Agency (ESA), plan to send spacecraft to Mars to retrieve these secured samples. Once back on Earth, these samples will undergo thorough analysis.

The 2020 Mars Perseverance mission is a component of NASAs wider Moon to Mars exploration strategy. This includes the Artemis missions to the Moon, designed to lay the groundwork for future human expeditions to Mars.

The Jet Propulsion Laboratory (JPL), run by Caltech in Pasadena, California on behalf of NASA, is responsible for both the construction and operational management of the Perseverance rover.

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A Mighty Martian River? Latest Astonishing Discovery by NASA's Perseverance Mars Rover - SciTechDaily