Across
- 4. Often referred to as dirty snowballs
- 6. Formed by debris
- 7. Also called shooting stars
- 9. Another name for big dipper
- 10. Another term for inner planets
- 11. Hit earth around every 100 million years
Down
- 1. Another word for outer planets
- 2. First to propose heliocentric universe
- 3. First to come up with a geocentric universe
- 5. Celestial body orbiting the sun
- 6. Pieces of rock floating through space
- 8. Orbit the sun between Mars and Jupiter