The moon is our constant companion and the only natural object that always orbits Earth. It's about four times smaller than Earth and its gravity is much weaker, which is why astronauts bounce around ...

Strange variations in the light from a distant star have been attributed to the dust thrown up by a giant collision remarkably similar to the one that produced the Moon. It is generally accepted that ...

The Moon may preserve a chemical record of Earth’s ancient atmosphere, and those same materials could one day support future ...