The debris landed like missiles, digging out two canyons comparable in size to Arizona's Grand Canyon in barely 10 minutes. The latter, by comparison, took millions of years to form. "This was a ...

The Grand Canyon on Earth versus the ones on the Moon are a study ... The canyons will be targeted for geological collection, because rocks at their bottoms will represent ancient material in ...

From spectacular landscapes — hello, Havasu Falls — to artistic wonders, here are 10 of the most beautiful things to see in ...

With 22 national parks and monuments to its name, Arizona boasts some of the most astonishing landscapes in the country, from the Grand Canyon to the towering buttes of Monument ...

The debris landed like missiles, digging out two canyons comparable in size to Arizona’s Grand Canyon in barely 10 minutes.

The debris landed like missiles, digging out two canyons comparable in size to Arizona's Grand Canyon in barely 10 ... at the Moon’s surface, where an ancient asteroid strike carved out a ...

This image provided by NASA shows a view from orbit looking obliquely across the surface of the moon, where an ancient asteroid ... in size to Arizona’s Grand Canyon in barely 10 minutes.

How an Ancient Asteroid Strike Carved Out 2 Grand ... digging out two canyons comparable in size to Arizona's Grand Canyon in barely 10 minutes. The latter, by comparison, took millions of years ...