New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons ...
Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object ...
The Earth's Grand Canyon took millions of years to carve, but the moon's grand canyons took about ten minutes.
Two gargantuan canyons on the moon were carved by a hailstorm of rocks — and that’s good news for future lunar astronauts.