NASA Curiosity Rover: Water helped shape Mars

This evenly layered rock photographed by the Mast Camera (Mastcam) on NASA's Curiosity Mars Rover shows a pattern typical of a lake-floor sedimentary deposit not far from where flowing water entered a lake.

The scene combines multiple frames taken with Mastcam's right-eye camera on Aug. 7, 2014, during the 712th Martian day, or sol, of Curiosity's work on Mars.

It shows an outcrop at the edge of "Hidden Valley," seen from the valley floor.

This view spans about 5 feet (1.5 meters) across in the foreground.

An annotated image of MastCam on Curiosity rover.

Credit: NASA JPL

The colour has been approximately white-balanced to resemble how the scene would appear under daytime lighting conditions on Earth.

The image at the top of the page has a superimposed scale bar of 50 centimeters (about 20 inches).

This is an example of a thick-laminated, evenly-stratified rock type that forms stratigraphically beneath cross-bedded sandstones regarded as ancient river deposits.

These rocks are interpreted to record sedimentation in a lake, as part of or in front of a delta, where plumes of river sediment settled out of the water column and onto the lake floor.

NASA Mars Curiosity Rover Stalled by 'Hidden Valley' Sand Trap

Click on the picture to see the full image.

NASA’s Curiosity rover looks back to ramp with 4th drill site target at ‘Bonanza King’ rock outcrop in ‘Hidden Valley’ in this photo mosaic view captured on Aug. 6, 2014, Sol 711. 

Inset shows results of brushing on Aug. 17, Sol 722, that revealed gray patch beneath red dust. Note the rover’s partial selfie, valley walls, deep wheel tracks in the sand dunes and distant rim of Gale crater beyond the ramp. Navcam camera raw images stitched and colorized. 

Credit: NASA/JPL-Caltech/Ken Kremer-kenkremer.com/Marco Di Lorenzo


This image, taken by NASA's Mars rover Curiosity in August 2014, looks across the northeastern end of sandy "Hidden Valley" to the lower slopes of Mount Sharp on the horizon.

Credit: NASA/JPL-Caltech

NASA's Mars rover Curiosity may have to choose a new route to the base of a huge Red Planet mountain.

The 1-ton Curiosity rover had been heading for Mount Sharp, a 3.4-mile-high (5.5 kilometers) mountain in the center of Mars' Gale Crater, via "Hidden Valley," a sandy swale that's about the length of a football field.

But Curiosity turned back shortly after entering the valley's northeastern end earlier this month, finding the sand surprisingly slippery, NASA officials said.

"We need to gain a better understanding of the interaction between the wheels and Martian sand ripples, and Hidden Valley is not a good location for experimenting," Curiosity project manager Jim Erickson, of NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, said in a statement.

This photo taken on Aug. 12, 2014 by NASA's Curiosity Mars rover shows an outcrop that includes the "Bonanza King" rock under consideration as a drilling target.

Credit: NASA/JPL-Caltech/MSSS

There is no way out of Hidden Valley save exits at its northeastern and southwestern ends, NASA officials said.

The mission team is now assessing possible alternative routes that would take Curiosity north of the valley.

The goal is to get Curiosity to Mount Sharp, which has been the rover's ultimate science destination since before its August 2012 touchdown.

Mission scientists want the six-wheeled robot to climb up through the mountain's foothills, reading a history in the rocks of Mars' transition from a warm and wet planet in the ancient past to the cold, dry world we know today.

The chief goal of the $2.5 billion Curiosity mission is to determine if the Red Planet could ever have supported microbial life.

The team has already checked off this goal, finding that an area near Curiosity's landing site called Yellowknife Bay was a habitable lake-and-stream system billions of years ago.

Researchers came to this conclusion last year after analyzing samples Curiosity drilled from two different rocks in Yellowknife Bay.

NASA Mars Rover Curiosity nears mountain-base outcrop

This full-circle panorama of the landscape surrounding NASA's Curiosity Mars rover on July 31, 2014, offers a view into sandy lower terrain called "Hidden Valley," which is on the planned route ahead. 

It combines several images from Curiosity's Navigation Camera (NavCam). South is at the center. 

Credit: NASA/JPL-Caltech 

As it approaches the second anniversary of its landing on Mars, NASA's Curiosity rover is also approaching its first close look at bedrock that is part of Mount Sharp, the layered mountain in the middle of Mars' Gale Crater.

The mission made important discoveries during its first year by finding evidence of ancient lake and river environments.

During its second year, it has been driving toward long-term science destinations on lower slopes of Mount Sharp.

Those destinations are in an area beginning about 2 miles (3 kilometers) southwest of the rover's current location, but an appetizer outcrop of a base layer of the mountain lies much closer, less than one-third of a mile (500 meters) from Curiosity. The rover team is calling the outcrop "Pahrump Hills."

"We're coming to our first taste of a geological unit that's part of the base of the mountain rather than the floor of the crater," said Curiosity Project Scientist John Grotzinger of the California Institute of Technology, Pasadena. "We will cross a major terrain boundary."

For about half of July, the rover team at NASA's Jet Propulsion Laboratory in Pasadena, California, drove Curiosity across an area of hazardously sharp rocks called "Zabriskie Plateau."

Damage to Curiosity's aluminum wheels from driving across similar terrain last year prompted a change in route planning to skirt such rock-studded terrain wherever feasible.

The one-eighth mile (200 meters) across Zabriski Plateau was one of the longest stretches without a suitable detour on the redesigned route toward the long-term science destination.

The main map shows landforms near NASA's Curiosity Mars rover as the rover's second anniversary of landing on Mars nears. 

The gold traverse line ends at Curiosity's position as of July 31, 2014 (Sol 705).

The inset shows the entire traverse and the remaining distance to Murray Buttes. Credit: NASA/JPL-Caltech 

"The wheels took some damage getting across Zabriskie Plateau, but it's less than I expected from the amount of hard, sharp rocks embedded there," said JPL's Jim Erickson, project manager for Curiosity.

"The rover drivers showed that they're up to the task of getting around the really bad rocks. There will still be rough patches ahead."

"We didn't imagine prior to landing that we would see this kind of challenge to the vehicle, but we're handling it."

Another recent challenge appeared last week in the form of unexpected behavior by an onboard computer currently serving as backup.

Curiosity carries duplicate main computers. It has been operating on its B-side computer since a problem with the A-side computer prompted the team to command a side swap in February 2013.

Work in subsequent weeks of 2013 restored availability of the A-side as a backup in case of B-side trouble.

Last week, fresh commanding of the rover was suspended for two days while engineers confirmed that the A-side computer remains reliable as a backup.

Curiosity landed inside Gale Crater on Aug. 5, 2012, PDT (Aug. 6, 2012, EDT). During its first year of operations, it fulfilled its major science goal of determining whether Mars ever offered environmental conditions favorable for microbial life.

Clay-bearing sedimentary rocks on the crater floor in an area called Yellowknife Bay yielded evidence of a lakebed environment billions of years ago that offered fresh water, all of the key elemental ingredients for life, and a chemical source of energy for microbes, if any existed there.

NASA's Mars Science Laboratory Project continues to use Curiosity to assess ancient habitable environments and major changes in Martian environmental conditions.

The destinations on Mount Sharp offer a series of layers that recorded different chapters in the environmental evolution of early Mars.