Scientists proposed an explanation for the formation of Vallis Schrödinger and Vallis Planck near the lunar south pole, which ...

A flight over the upper Grand Canyon offers a view of the edge of the Navajo Reservation (far side of the canyon). No single spot provides a view of the whole canyon. Its scale disguises its ...

Plan a winter trip to the Grand Canyon with our winter guide to the Grand Canyon. Don't let a little snow keep you from ...

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

The Grand Canyon reminds ... hardest thing about running the canyon is not the rapids; it's being confronted with what I call the weight of cosmic time. The whole earth story is on display here ...

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

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