Across
- 4. first developed theory of orbits
- 6. planet takes 365 days to orbit sun
- 8. curved path a planet in space follows
- 9. complete circuit around a central point
- 10. having the shape of an oval
- 12. planet closet to the sun
Down
- 1. what greeks call planets
- 2. the speed a planet travels in orbit
- 3. meeting specific requirements
- 5. planet farthest from the sun
- 7. number of planets
- 11. technology used to help see planets move