Across
- 5. Distance light travels in one year
- 8. Largest object in the solar system
- 10. Collection of Sun, planets, orbiting material
- 11. Earth's average orbital distance
- 13. Sun centered
- 16. All matter and energy
- 18. Small and rocky
- 19. Collection of galaxies held together by gravity
Down
- 1. Our galaxy
- 2. Beginning of the universe
- 3. Pluto is now one of these
- 4. Energy generation mechanism in stars
- 6. Carl Sagan said that we are made of this
- 7. Small and icy
- 8. Our galaxy is this type
- 9. Earth centered
- 12. Our group of 40 nearby galaxies
- 14. The universe is doing this all the time
- 15. Earth does this each day on its axis
- 17. Earth does this once a year, around the Sun