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 ...

In 1908, explorer G.E. Kincaid made a shocking discovery in the Grand Canyon: a man-made cavern with hundreds of carved steps leading to what appeared to be ancient relics. Could this be evidence ...

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

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.

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.