Postcards from Mars: Nasa releases first high-res colour images of the Red Planet as Curiosity rover takes its second drive
By Mark Prigg
PUBLISHED: 04:50 GMT, 28 August 2012 | UPDATED: 10:03 GMT, 28 August 2012
NASA has showed off the first spectacular hi resolution colour images taken by the Mars rover Curiosity, detailing a mound of layered rock where scientists plan to focus their search for the chemical ingredients of life on the Red Planet.
The stunning photographs reveal distinct tiers of near the base of the 3-mile-tall mountain that rises from the floor of the vast, ancient impact basin known as Gale Crater, where Curiosity landed on August 6 to begin its two-year mission.
They were taken as Curiosity took its second drive on the red planet, moving to take a close look at bedrock its thrusters exposed during landing.
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Mount Sharp: This color image from NASA's Curiosity rover showing the base of Mount Sharp, the rover's eventual science destination
CURIOSITY'S SECOND DRIVE
In Curiosity's second drive, it rotated about 90 degrees, drove about 16 feet (5 meters), then rotated back about 120 degrees to face roughly the same direction from which it started.
Nasa officials said it placed Curiosity directly over a patch where one of the spacecraft’s landing engines scoured away a few inches of gravelly soil and exposed underlying rock.
Researchers plan to use a neutron-shooting instrument on the rover to check for water molecules bound into minerals at this partially excavated target, they said.
The telephoto images, taken from the 100-millimetre telephoto lens and the 34-milllimetre wide angle lens of the Mast Camera (Mastcam) instrument, beamed back to Earth show a scene of eroded knobs and gulches on a mountainside, with geological layering clearly exposed.
Mastcam has photographed the lower slope of the nearby mountain called Mount Sharp.
'This is an area on Mount Sharp where Curiosity will go,' said Mastcam principal investigator Michael Malin of the Malin Space Science Systems in San Diego.
'Those layers are our ultimate objective.
The dark dune field is between us and those layers.
In front of the dark sand you see redder sand, with a different composition suggested by its different colour.
The rocks in the foreground show diversity — some rounded, some angular, with different histories.
This is a very rich geological site to look at and eventually to drive through,' Malin said.
Scientists estimate it will be a year before the six-wheeled, nuclear-powered rover, about the size of a small car, physically reaches the layers of interest at the foot of the mountain, known as Mount Sharp, 6.2 miles away from the landing site.
From earlier orbital imagery, the layers appear to contain clays and other hydrated minerals that form in the presence of water.
While previous missions to Mars have uncovered strong evidence for vast amounts of water flowing over its surface in the past, Curiosity was dispatched to hunt for organic materials and other chemistry considered necessary for microbial life to evolve.
The $2.5 billion Curiosity project, NASA's first astrobiology mission since the 1970s-era Viking probes to Mars, is the first to bring all the tools of a state-of-the-art geochemistry laboratory to the surface of a distant planet.
Mast camera: This image, taken by the Mast Camera, highlights the geology of Mount Sharp, a mountain inside Gale Crater, where the rover landed
But the latest images from Curiosity, taken at a distance from its primary target of exploration, already have given scientists a new view of the formation's structure.
The layers above where scientists expect to find hydrated minerals show sharp tilts, offering a strong hint of dramatic changes in Gale Crater, located in the planet's southern hemisphere near its equator.
Mount Sharp, the name given to the towering formation at the center of the crater, is believed to be the remains of sediment that once completely filled the 96-mile-wide basin.
'This is a spectacular feature that we're seeing very early,' project scientist John Grotzinger, with the California Institute of Technology, said as the images were released on Monday.
Mars surface: The MastCam data now reveal a strong discontinuity in the strata above and below the line of white dots
'We can sense that there is a big change on Mount Sharp.'
The higher layers are steeply slanted relative to the layers of underlying rock, the reverse of similar features found in Earth's Grand Canyon.
'The layers are tilted in the Grand Canyon due to plate tectonics, so it's typical to see older layers be more deformed and more rotated than the ones above them,' Grotzinger said.
'In this case, you have flat-line layers on Mars overlaid by tilted layers.
'The science team, of course, is deliberating over what this means.'
Nasa also released a new colour panorama showing a 360-degree view of the landing site of NASA's Curiosity rover, including the highest part of Mount Sharp visible to the rover.
He added: 'This thing just kind of jumped out at us as being something very different from what we ever expected.'
Absent plate tectonics, the most likely explanation for the angled layers has to do with the physical manner in which they were built up, such as being deposited by wind or by water.
'On Earth, there's a whole host of mechanisms that can generate inclined strata,' Grotzinger said.
'Probably we're going to have to drive up there to see what those strata are made of.'
The team has also taken Curiosity for its second drive.
This image taken by a front camera on NASA's Curiosity shows track marks from the rover's two Martian drives.
Track marks from a successful drive to the scour mark known as Goulburn, an area of bedrock exposed by thrusters on the rover's descent stage.
Double act: U.S. Sen. Dianne Feinstein, fourth from right, tours NASA's Mars Curiosity double rover at the Vehicle System Test Bed, or VSTB, inside the In-Situ Instrument Laboratory at NASA's Jet Propulsion Laboratory in Pasadena, California last Thursday
Laboratory: California Gov. Jerry Brown, center, toured NASA's Mars Curiosity rover mission In-Situ Instrument Laboratory room last Wednesday
NASA said it used the rover to broadcast a message of congratulations to the Curiosity team from NASA chief Charles Bolden, a demonstration of the high bandwidth available through a pair of U.S. science satellites orbiting Mars.
'This is the first time that we've had a human voice transmitted back from another planet' beyond the moon, said Chad Edwards, chief telecommunications engineer for NASA's Mars missions at the Jet Propulsion Laboratory in Pasadena, California.