Even though humans have pondered the moon since the first of us looked skyward, there is still much we don't know about it.

This is consistent with the Lunar Magma Ocean hypothesis — known as the LMO — which holds that the moon’s crust formed as magma cooled roughly 4.4 billion years ago. The moon was much closer ...

This theory, known as the lunar magma ocean (LMO) model, describes how the debris from the impact of Theia coalesced to form the moon, with the energy from this event causing the newly formed moon ...

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

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

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

Another explanation is that, following the impact that formed the basin, a huge ocean of metal-rich magma pooled inside of the lunar crust and solidified into a dense slab.