NASA's Orion capsule is on its way home from the moon to wrap up a three-week test flight.

A space capsule is hurtling toward the moon for the first time in 50 years.

Since the moon is Earth's closest celestial neighbor, we've been able to learn more about it than any other in the solar system. There are surprising details about the moon, such as how in 1958, the US proposed exploding a nuclear bomb on its surface, for clout. Twelve men walked on the moon between those years, and all spacecraft on the moon's surface since have been unmanned. Astronauts will dock Orion at the Gateway, a spacecraft where they will live and work around the moon. Tides are caused by the moonThere are two bulges in Earth resulting from the gravitational pull of the moon.