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 ...

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

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 two ...