"An epic exploration of possibilities. What If is a Webby Award-winning science web series that takes you on a journey ...

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.

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Two canyons that splay out from a vast asteroid crater on the moon may have been quickly formed by chains of impacts that ...

A colossal impact billions of years ago carved out the canyons that rival the most breathtaking features here on Earth in a ...