Allie - space

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