The lunar canyons Vallis Schrödinger and Vallis Planck are extraordinarily deep, and scientists now know the valleys were ...

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

On Wednesday, the Navajo Nation reached an agreement with Energy Fuels, the nation's largest uranium producer, to resume shipments within the protected area ... Mine near the Grand Canyon ...

If you're looking for the ultimate outdoor photo spot, Utah has vibrant purple mountains - and they're near the state's mini" Grand Canyon too!

The Earth's Grand Canyon took millions of years to carve, but the moon's grand canyons took about ten minutes.

That's good news for scientists and NASA, which is looking to land astronauts at the south pole on the near, Earth-facing ...

This map shows areas of distinct bioclimate ... Each view emphasizes a different feature or dimension of the Grand Canyon and surrounding areas. Some are focused on the terrain and topography ...

Ryan Crow of the U.S. Geological Survey (USGS) gave a talk to a packed crowd at the Museum of Northern Arizona Jan. 12 ...

Outdoor retailer REI has closed its Experiences business. Here's what that means for the campground it planned to open in ...