Mars may be named for the god of war, but these weird things aren’t cannonballs. They&
Mars may be named for the god of war, but these weird things aren’t cannonballs. They’re pebbles. The round 0.2 inch (5 mm) concretion I found (top) contains calcium sulfate, sodium and magnesium, making it different from the hematite-rich “blueberries” (bottom) the Opportunity rover found. Cool! -- source link
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