Across
- 2. beyond neptune
- 3. amount of matter
- 10. night
- 11. multiple quantities
- 12. night sky shining
- 13. earliest known periods
- 15. earth; Neptune; etc.
- 16. instrument to see stars
- 17. sphere activity
- 18. night sky ice and dust
- 20. astronomical distance
Down
- 1. shaped in solar system
- 4. rotate on
- 5. sun is center
- 6. object in space
- 7. sky; universe
- 8. all the planets
- 9. around earth; object
- 14. star wars
- 19. icy surround sun