A 20-year-old man from California was found dead 1,000 feet below the South Rim of the Grand Canyon, National Park Service ...

Two such lunar canyons, Vallis Schrödinger and Vallis Planck, stretch over 270 km (168 miles) each, with depths of 2.7 km ...

Zion National Park to Grand Canyon road trip guide • Discover the best route, scenic stops, travel tips, and must-see ...

New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons ...

New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons ...

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!

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