Beneath the waters of Chesapeake Bay lies a massive secret that took decades to uncover. What once seemed like a normal ...
"Nearly four billion years ago an asteroid or comet flew over the lunar ... that carved two canyons that are the size of Earth's Grand Canyon. While the Grand Canyon took millions of years to ...
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 ...
(AP) — 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.