Grand Canyon, Asteroid

New research shows that when an asteroid slammed into the moon billions ... digging out two canyons comparable in size to Arizona's Grand Canyon in barely 10 minutes. The latter, by comparison ...
The incoming object created an impact basin and sent streams of rocks hurtling like missiles, NASA said. Within minutes, two ...
WASHINGTON, Feb 4 (Reuters) - The Grand Canyon in Arizona is one of ... in diameter, larger than the asteroid that struck Earth 66 million years ago and doomed the dinosaurs.