About 3.8 billion years ago, two massive canyons likely formed on the moon in a span of less than 10 minutes, according to new research. The extraordinary formations, each comparable in size to ...

A recent study from the University of New Mexico has proposed a fascinating theory about the formation of the Grand Canyon.

Visitors to the Grand Canyon always want to know: How old is it? Park rangers are instructed to tell them the canyon has been carved by the Colorado River for the past 5 million or 6 million years.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. About 3.8 billion ...