A series of rocks hiding around Colorado's Rocky Mountains may hold clues to a frigid period in Earth's past when glaciers several miles thick covered the entire planet.

More than a year later, a father-daughter duo from the United States finally cracked the code. Ken and Keli Chaffin ran ...

In 1986, humanity gained its first close look into the secrets of Uranus thanks to the Voyager 2 probe. This probe, after a ...

Around 700 million years ago, the Earth cooled so much that scientists believe massive ice sheets encased the entire planet ...

Explore daily insights on the USA TODAY crossword puzzle by Sally Hoelscher. Uncover expert takes and answers in our ...