Spanning 25 miles in diameter, this crater is three times the size of the Grand Canyon, making it the largest known impact site in the U.S. and the 15th largest on Earth. The asteroid’s ...

(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.

UNLV geoscientist Arya Udry shares what motivates her in studying space, her work on the Mars Perseverance mission, and the world of knowledge a meteorite can bring.

"Kacey experiences the awe-inspiring beauty of the Grand Canyon for the first time, with an emotional reaction." ...

Dinosaurs weren't in decline when an asteroid smashed into Earth and wiped them out, scientists say. Instead, the idea that dinosaur diversity was declining before the asteroid struck 66 million ...