Two gigantic canyons on the moon — both deeper than the Grand Canyon — were carved in less than 10 minutes by floods of rocks ...
Even though humans have pondered the moon since the first of us looked skyward, there is still much we don't know about it.
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.
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