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Mystery Spheres on Mars Baffle Scientists
2012-09-17 0:00

By Tariq Malik | DiscoveryNews

The mysterious geological formations seem to be crunchy on the outside and softer in the middle.

A strange picture of odd, spherical rock formations on Mars from NASA’s Opportunity rover has scientists scratching their heads over what exactly they’re looking at.

Mission scientist say they’ve never seen such a dense accumulation of spherules in a rock outcrop on Mars.

The new Mars photo by Opportunity shows a close-up of a rock outcrop called Kirkwood covered in blister-like bumps that mission scientists can’t yet explain. At first blush, the formations appear similar to so-called Martian "blueberries" -- iron-rich spherical formations first seen by Opportunity in 2004 -- but they actually differ in several key ways, scientist said.

"This is one of the most extraordinary pictures from the whole mission," said rover mission principal investigator Steve Squyres of Cornell University in Ithaca, N.Y., in a statement.

"Kirkwood is chock full of a dense accumulation of these small spherical objects. Of course, we immediately thought of the blueberries, but this is something different. We never have seen such a dense accumulation of spherules in a rock outcrop on Mars."

The new photo by Opportunity is actually a mosaic of four images taken by a microscope-like imager on its robotic arm, and then stitched together like puzzle pieces by scientists on Earth.

Opportunity on Mars

The Mars rover Opportunity is currently exploring a location known as Cape York along the western rim of a giant Martian crater called Endeavour. Opportunity is one of two golf cart-size NASA rovers that landed on Mars in January 2004 (Spirit was the other) to explore different landing sites.

The solar-powered rovers were initially expected to last just 90 days on Mars, but each survived for years on the Red Planet. Spirit stopped communicating with Earth in 2010, but Opportunity is still operational.

Despite its advanced age, Opportunity is still pumping out new discoveries after more than eight years on Mars. The rover first spotted Martian blueberries soon after its landing in 2004. The blueberries are actually concretions created by minerals in water that settled into sedimentary rock.

Opportunity has seen Martian blueberries at many of its science sites during its Red Planet exploits, but the bumpy, spherical formations on the Kirkwood rock represent something new, researchers said. In Opportunity’s new photo, many of the strange features are broken, revealing odd concentric circles inside.

"They seem to be crunchy on the outside, and softer in the middle," Squyres said. "They are different in concentration. They are different in structure. They are different in composition. They are different in distribution. So, we have a wonderful geological puzzle in front of us."

Squyres said he and his science team have several theories, but none that truly stand out as the best explanation for what could have created the weird bumps on Mars.

"It’s going to take a while to work this out, so the thing to do now is keep an open mind and let the rocks do the talking," he said.


Read the full article at: news.discovery.com

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