Earth, Sun, and Moon is a series of interactive games that varies from shooting asteroids with your rocket ship to learning about the phases of the Moon as seen from Earth.

Applications for Science Teachers: Seems very appropriate as a supplement/extension to elementary Earth/Space instruction. 

Other Resources to Consider:

Gravity Launch: Program the launch of a rocket to successfully complete a series of missions- this has been a favorite of mine for a long time.

Multiflyer: Learn your multiplication facts as you journey the solar system! It doesn’t get much better than this.