The sky and the planets

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Across
  1. 3. A visible mass of condensed water vapor floating in the atmosphere
  2. 4. Frozen water falling from the sky
  3. 6. The space above the Earth
  4. 7. Water falling from the sky
  5. 8. The hottest planet
  6. 11. The sound produced by lightning
  7. 14. A piece of rock or metal that enters the Earth's atmosphere
  8. 17. A planet that rotates on its side
  9. 18. A flash of light produced by an electrical discharge
  10. 19. A celestial object consisting of ice and dust
Down
  1. 1. A celestial body that orbits a star
  2. 2. The smallest planet in our solar system
  3. 5. The farthest planet from the Sun
  4. 6. The star at the center of our solar system
  5. 9. The planet we live on
  6. 10. A celestial body that emits light
  7. 12. The planet with rings
  8. 13. The Earth's natural satellite
  9. 14. The Red Planet
  10. 15. The largest planet in our solar system
  11. 16. The movement of air