Across
- 3. The phase of the moon displaying the most light
- 6. The two points inside an ellipse
- 7. Name means the "wanderers"
- 8. Sun-centered universe
- 11. Three laws of planetary motion
- 12. ...and Mercury are the only planets with no moons.
- 13. The tide that occurs when the moon is in line with the earth and sun
- 15. 365 1/4 days
- 17. The law of universal gravitation
- 18. The amount of time it takes for a comet to complete its orbit
Down
- 1. Made up of the sun and all the heavenly bodies that orbit it.
- 2. A band of comet-like objects located beyond the orbit of Neptune
- 4. The force of attraction that exists between any two objects
- 5. The earth completes one ... in 24 hours
- 9. Symmetrically shaped oval
- 10. An asteroid-sized chunk of rock, dust, and ice that develops a huge, bright "tail" as it approaches the sun.
- 14. Earth-centered universe
- 16. Distance between the earth and the sun