Light, shadow and space

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Across
  1. 2. Closest planet to the sun.
  2. 5. Space traveler.
  3. 10. Farthest planet from the sun.
  4. 11. Red planet.
  5. 15. Biggest planet.
  6. 16. Dark shape on the ground.
  7. 17. Where the stars are.
  8. 18. Orbits the Earth.
Down
  1. 1. Ball of fire in the sky.
  2. 3. Our home planet.
  3. 4. Ice ball with a tail.
  4. 6. Hole on the moon.
  5. 7. Shooting star.
  6. 8. Hottest planet and second from the sun.
  7. 9. Coldest planet and blue.
  8. 12. Makes things bright.
  9. 13. Rock in space.
  10. 14. Planet with rings.