Across
- 2. the earth's natural satellite
- 3. It is the only planet that has liquid water on its surface
- 7. relating to the earth as center
- 8. The act or process of turning around a center or an axis
Down
- 1. system made up of all the planets that orbit our Sun
- 4. a theory that places the Sun as the center of the universe, and the planets orbiting around it
- 5. the star that the Earth moves around and that gives the Earth heat and light
- 6. a repeating path that one object in space takes around another