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NASA: 'Cannonball' spotted on Mars isn't what it seems - CNET

NASA's Curiosity rover spotted this wonderfully round pebble on Mars. NASA/JPL-Caltech/Red circle by Amanda Kooser/CNET

If we ever found a real cannonball on Mars, it would make us question everything we know about the history of the Red Planet. That transformative moment hasn't happened yet.

NASA's Mars Curiosity rover Twitter account posted an intriguing message on Tuesday highlighting some spherical objects found on the planet:

Mars may be named for the god of war, but these weird things aren't cannonballs. They're pebbles. The round 5mm concretion I found (L) contains calcium sulfate, sodium + magnesium, making it different from the hematite-rich "blueberries" (R) @MarsRovers Opportunity found. Cool!— Curiosity Rover (@MarsCuriosity) December 5, 2017

The Curiosity image shows a delightfully round shape sitting on the dusty surface of Mars. Though the rover first snapped images of the area in late 2016 and early 2017, the photos are receiving...(continued)

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