About 35 million years ago, an asteroid struck the ocean off the East Coast of North America, leaving behind a massive impact ... known impact crater in the United States and ranks as the 15th ...

A giant valley deeper than the Grand Canyon is buried beneath ... radar data from both ends of this huge hidden valley, but we had no information to tell us what was in between," said Ross.

Nearly a mile (1.5 km) larger than ... that made a crater more than 90% of Vesta's diameter. The same pattern applies to the grandest canyons as well. Sure, the grand canyon is legitimately ...

The extraordinary formations, each comparable in size to Earth’s Grand Canyon ... more than 700 times greater than the total yield of nuclear explosion tests conducted by the United States ...

It only took less than ... Grand Canyon in depth. Future lunar surface explorers will be awed." This pair of lunar canyons represents two of many valleys radiating out from Schrödinger basin, a ...

About 3.8 billion years ago, two massive canyons likely formed on the moon in a span of less than ... us on the moon.” The Schrödinger impact basin, one of the younger, large impact craters ...