Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object slammed into the moon 3.8 billion years ago.

The Grand Canyon in Arizona is one of Earth's natural wonders, carved out over millions of years by the gradual erosion power of the Colorado River. Close to the moon's south pole are two canyons ...

Two gigantic canyons on the moon — both deeper than the Grand Canyon — were carved in less than 10 minutes by floods of rocks traveling as fast as bullets, a new study finds.

Two canyons near the south pole of the moon rival the Grand Canyon, both in depth and length. Unlike the sinuous chasm in Arizona, the two lunar canyons, known as Vallis Schrödinger and Vallis ...