Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object ...
Two such lunar canyons, Vallis Schrödinger and Vallis Planck, stretch over 270 km (168 miles) each, with depths of 2.7 km ...
Two gigantic canyons on the moon — both deeper than the Grand Canyon — were carved in less than 10 minutes by floods of rocks ...