A new theory suggests the two moons then crashed together, forming our current moon.
A strange-looking impact crater has been spotted by NASA's current lunar satellite.
Scientists have found evidence of volcanoes on the far side of the moon.
The shuttle's smooth landing closes the curtain on a 30-year program that carried people to space.
Did ex-NASA astronaut Edgar Mitchell illegally take one of the Apollo 14 cameras, only to try to auction it for profit?
Astronomer Mark Thompson explains why, on Wednesday, a lunar eclipse is set to dazzle night skies (but not in the U.S., sadly)
The inside of the moon may have as much water as Earth's mantle, finds an analysis of moon crystals returned by Apollo astronauts.
We've already landed spacecraft on the moon, but can we do it on the cheap?
How did Earth manage to hold onto its organics after being slammed by a Mars-sized object 4.4 billion years ago?
The full moon looms large over Florida Saturday night.