Like all the planets in the Sol system, the Moon is an easter egg in Spore. On it you can find yellow spice, and sometimes purple spice. It is barren and full of craters, as the real moon is. The moon is both a Rocky Planet (like Mars, needing only an Atmosphere Generator to reach T1) , and a rare Crater Planet. It is destroyed if the Planet Buster is used on Earth. Maxis also made an adventure template version of the moon as part of a contest commemorating the Apollo moon landings.
Moon at T1. Some craters become puddles.
Moon at T2. Some puddles become oceans. Grass sprouts.
Moon at T3. Grass covers the Moon.
T3 Moon 85% water (fixed water not appearing in the picture to the left)