The Sun

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Across
  1. 4. What is the sun mostly comprised of
  2. 6. Outermost layer of the sun
  3. 8. What is everything made of
  4. 9. Device used to see distant planets
  5. 11. Center of an atom
  6. 13. What process gives the sun its energy
  7. 14. The study of space
  8. 16. What protects the earth from radiation
  9. 18. What is the sun
Down
  1. 1. How do plants get energy from the sun
  2. 2. Visible layer of the sun
  3. 3. Center of the sun
  4. 5. What keeps planets in orbit
  5. 7. The sun combines hydrogen with what element
  6. 10. What is the fourth state of matter
  7. 11. Furthest planet from the sun
  8. 12. Bright lights in the sky seen at night
  9. 15. Explosion during the death of a star
  10. 17. Closest planet to the sun