Planets Crossword

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Across
  1. 3. This is the largest planet
  2. 8. The expanding outer shell of a star to become a white dwarf
  3. 13. Areas on the sun that are cooler than other place
  4. 14. The distance light travels in one year
  5. 15. The first stage in a star lifecycle
  6. 16. The explosion of a very large star
  7. 17. A huge cloud of dust and gas from which stars form from
  8. 19. The total amount of light given off by a star
  9. 20. An enormous hot ball of gas
Down
  1. 1. A small star with a high temperature and low brightness
  2. 2. The amount of light from a star that reaches earth
  3. 4. A star and its planets
  4. 5. A system of two stars orbiting each other
  5. 6. The method of studying and object by examining the visible light
  6. 7. The large star in the center of our solar system
  7. 9. the final four planets
  8. 10. A chunk of burning rock traveling through earth's atmosphere
  9. 11. An object made up of ice and dust that is in space
  10. 12. A large star with low temperature but high brightness
  11. 18. This was once a planet, but now is not