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

Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object slammed into the moon 3.8 billion years ago.

These are the best national parks to find big adventure and warm weather for your one precious week off during spring break ...

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