Geologists examine a massive fissure in Arizona and find that may have existed way before it caught public attention.
Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object ...
But Arizona isn't the only place where an ambitious explorer can find a Grand Canyon. NASA’s Lunar Reconnaissance Orbiter has snapped pictures of two gigantic basins on the lunar surface.
New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons ...
The vast valleys of Vallis Schrödinger and Vallis Planck demonstrate the incredible forces that shaped the face of the Moon.