Saturday, September 15, 2012

Mystery Spheres on Mars Have Scientists Scratching Their Heads

PHOTO CREDIT: NASA/JPL-Caltech/Cornell Univ./ USGS/Modesto Junior College and

Strange Mystery Spheres on Mars Baffle Scientists 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.

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."

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