Scientists analyzed the lunar canyons, named Vallis Schrödinger and Vallis Planck, to find that these huge valleys measure 167 miles long (270 kilometers) and nearly 1.7 miles (2.7 km) deep, and ...

About the canyons: The two canyons, called Vallis Schrödinger and Vallis Planck, are located on the far side of the moon, so they can only be seen from orbit — not from Earth.

The two gorges carved by asteroid debris are roughly the size of the Grand Canyon in Arizona (which took roughly five to six million years to form), with Vallis Schrödinger at 168 miles (270 ...