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 moon quickly began to cool. Most of the lunar magma ocean solidified almost right away by geologic standards—about a single millennium. But once about 80% of the magma had solidified, a crust of ...

NASA's Juno spacecraft has discovered a giant volcanic hot spot on the surface of Jupiter's hellish moon Io. The eruptions in ...

The Grand Canyon in Arizona is one of Earth's natural wonders, carved out over millions of years by the gradual erosion power ...

"Whereas Arizona’s Grand Canyon was carved by water over the last 5 to 6 million years and from integrated paleocanyons that ...

Our planet's Moon might look dead and stagnant from our vantage point here on Earth, but a new study suggests it was moving ...