Solar System

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Across
  1. 5. the average distance between the Sun and Earth
  2. 7. occurs when comet particles burn up as they enter Earth's atmosphere
  3. 10. an asteroid fragment
  4. 13. dense inner planets
  5. 15. can form planets through collisions and mergers
  6. 17. a small fragment of meteoroid that hits the ground
  7. 18. low, warm, dark-colored cloud
Down
  1. 1. a streak of light produced by a meteoroid
  2. 2. a line of cliffs
  3. 3. high, cool, light-colored cloud
  4. 4. form of hydrogen that has liquid and metallic properties
  5. 6. body made of ice and rock that has one or more tails
  6. 8. planet's backward movement
  7. 9. a body that hasn't cleared its orbit of small debris
  8. 11. region outside of Neptune and where small solar system bodies form
  9. 12. a large planet that lacks solid surfaces
  10. 14. defines the shape of a planet's elliptical orbit
  11. 16. the shape of planets' orbit