September 14

Eight years ago, NASA’s Opportunity rover came across strange-looking spheres that were nicknamed Martian blueberries — and now the rover has sent back a picture showing a different flavor of Marsberry that has the experts scratching their heads.

“This is one of the most extraordinary pictures from the whole mission,” Cornell astronomer Steve Squyres, the rover mission’s principal investigator, said today in a news release.

The golf-cart-sized Opportunity rover used the microscopic imager on the end of its robotic arm to take a super-close look at the spherical shapes. These particular berries, measuring as much as one-eighth of an inch (3 millimeters) in diameter, cover an outcrop called Kirkwood in the Cape York segment of Endeavour Crater’s western rim.

“Kirkwood is chock full of a dense accumulation of these small spherical objects,” Squyres said. “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.”

via Spheres spark new Martian mystery – Cosmic Log.

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