With 22 national parks and monuments to its name, Arizona boasts some of the most astonishing landscapes in the country, from the Grand Canyon to the towering buttes of Monument ...
Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object ...
Scientists proposed an explanation for the formation of Vallis Schrödinger and Vallis Planck near the lunar south pole, which ...
The Grand Canyon in Arizona got carved by water over millions of years of slow but steady erosion. Two similarly-sized ...
Scientists say America is no longer the only place with a Grand Canyon as NASA spots two enormous chasms carved into the ...