Across
- 1. An imaginary line on which an object rotates.
- 5. 140 CE believed in epicycles.
- 6. 4th century BCE that believed there were crystalline spheres.
- 7. The Sun is the center of the universe.
- 9. Everything.
- 10. A wandering star.
- 12. The spinning of something on it's axis.
Down
- 2. One or more stars with planets revolving it.
- 3. The Earth is the center of the universe.
- 4. Mid 1500's believed in heliocentric.
- 8. The moving of one object around another.
- 11. A huge cloud made of stars, gas, and dust held together in a gravitational arrangement.