This is not an asteroid crater. Or so says a new study looking at the moon's largest dark spot Oceanus Procellarum (a.k.a Ocean of Storms). But the newly proposed origin is equally cool: A stretching of the lunar crust, driven by a process that researchers compare to plate tectonics here on Earth.

Image: Oceanus Procellarum by Kopernik Observatory/NASA/Colorado School of Mines/MIT/JPL/Goddard Space Flight Center (via Nature News)

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