This type of planetarium, called an orrery, models the relative positions and motion of the sun, moon, and Earth. With a strategically placed light source, you could use one to demonstrate an eclipse.

A new recreation of the Moon on Earth has sparked hopes of a “European renaissance” in space. Known as LUNA, the futuristic facility was inaugurated today in Cologne, Germany.

Earth, sun, moon: three objects in space whose interactions have a pretty big impact on our lives. Earth orbits the sun once a year, and it rotates on its axis about once a day (depending on your ...