But on the moon, where there’s no atmosphere ... and 3.5 km (2.2 miles), respectively — comparable to Earth’s Grand Canyon. Now, researchers have pieced together the violent cosmic event ...

The extraordinary formations, each comparable in size to Earth’s Grand Canyon, are hidden on the far side of the moon — the ...

CAPE CANAVERAL, Fla. (AP) — New research shows that when an asteroid slammed into the moon billions of years ago, it carved ...

(AP) — New research shows that when an asteroid slammed into the moon billions of years ago ... canyons comparable in size to Arizona’s Grand Canyon in barely 10 minutes.