Moon

A moon is a naturally-occuring satellite; a large rock orbiting a planet. Earth itself has only one such satellite, which is typically, in English, simply called "the Moon".

The moon is far smaller than the Earth (Though relative to the size of it's planet, the Moon is the largest in the Solar System), and therefore, posesses a far smaller magnetic attraction. This means that the Moon lacks an atmosphere, making it uninhabitable, without a contained air supply.

During the Psychic Dominator Disaster, Yuri had a base on the Moon. A Soviet Commander had hijacked on of Yuri's spacecraft, becoming his nation's first Astronaut. Soon, a battle raged on the moon. Using certain vehicles and infantry with airtight breathing apparatus, the Commander destroyed Yuri's moon base. How this event influenced Soviet space exploration remains to be seen.