Most of Earth’s impact craters await discovery

Ninety or more cavities wider than 1 kilometer remain to be found

Pingualuit Crater in northern Canada

HIDDEN HOLES  Hundreds of undiscovered craters wider than a quarter-kilometer across probably dot Earth’s surface, new research estimates. The Pingualuit Crater in northern Canada (shown) measures 3.44 kilometers wide.

Courtesy of Denis Sarrazin/NASA Earth Observatory

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