Solar System Crossword

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Across
  1. 2. second closest planet to the sun
  2. 5. our earth is always doing this but we can't see
  3. 6. closest planet to the sun
  4. 7. we live on it
  5. 11. this is made in the center of the sun
  6. 13. earth is the only known planet with ____
  7. 14. the symbol for this is He
  8. 15. a stream of protons moving radially from the sun
  9. 17. where all the other planets, galaxies etc. are
  10. 18. a place in space where gravity is so strong you can not escape it
  11. 19. scientists think this planet could sustain life or once did
  12. 20. there will someday in a very long time be an ___ to the sun and our earth, along with all of us.
Down
  1. 1. their are 8 of them in our solar system
  2. 3. when it's nighttime and clear you can see them
  3. 4. this phase happens after the red giant
  4. 8. our earth revolves around it
  5. 9. the sun will grow to this and eat planets
  6. 10. the sun is the center and the other planets circle
  7. 12. what each planet is on the circles the sun
  8. 16. our earth does this throughout the year