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