"Nearly four billion years ago an asteroid or comet flew over the lunar ... that carved two canyons that are the size of Earth's Grand Canyon. While the Grand Canyon took millions of years to ...

The Grand Canyon in the US is 29 km wide and attains ... David Kring, lead author of the paper, said that an asteroid or comet flew over the lunar south pole, brushed by the mountain summits ...

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. The latter, by comparison ...

digging out two canyons comparable in size to Arizona’s Grand Canyon in barely 10 minutes. The latter, by comparison, took millions of years to form. “This was a very violent, a very dramatic geologic ...

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. The latter, by comparison ...