The Grand Canyon in Arizona got carved by water over millions of years of slow but steady erosion. Two similarly-sized canyons on the moon got carved by flying rocks in about ten minutes.

Now, researchers say two unusually narrow and straight canyons that splay out from its centre were formed in less than 10 minutes by a chain of secondary debris impacts. David Kring at the Lunar ...

The Grand Canyon in Arizona got carved by water over millions of years of slow but steady erosion. Two similarly-sized canyons on the moon got carved by flying rocks in about 10 minutes.

WASHINGTON, Feb 4 (Reuters) - 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 ...