"Nearly four billion years ago an asteroid or comet flew over the lunar ... that carved two canyons that are the size of ...

WASHINGTON — The Grand Canyon in Arizona is one of Earth's natural ... 10 minutes by rocky debris sent violently aloft when an asteroid or comet struck the lunar surface roughly 3.8 billion ...

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 ...

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 ...

“Nearly four billion years ago, an asteroid or comet flew over the lunar ... to erode the landscape of Arizona to create the Grand Canyon. The celestial object that plowed into the moon likely ...

Asteroid Impact on Moon Blasted Two Grand Canyons in 10 Minutes By Will Dunham WASHINGTON (Reuters) - The Grand Canyon in Arizona is one of Earth's natural wonders, carved out over millions of ...

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.