The formation of the Moon billions of years ago is cloaked in mystery. Most astronomers believe the young Earth, still cooling off from its formation, was struck by a mars-sized body called Theia, ...

The moon, Earth’s closest neighbor, is among the strangest planetary bodies in the solar system. Its orbit lies unusually far away from Earth, with a surprisingly large orbital tilt. Planetary ...

The moon is Earth’s only friend. And yet—despite a relationship stretching back billions of years—the gap between us only grows wider. Someday, far in the future, we will be left alone. What happens ...