Astronomy Crossword Puzzle

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Across
  1. 7. what is the closest planet to the sun?
  2. 10. what is in between mars and jupiter?
  3. 11. what is the 7th planets "twin"?
  4. 12. what is the closest "twin" planet to the sun?
  5. 15. egg shaped galaxy?
  6. 16. what planet, if bigger, could be a star?
  7. 17. what planet do scientists know most about?
  8. 19. what planet is the brightest?
Down
  1. 1. what is the sun?
  2. 2. why do planets orbit the sun?
  3. 3. a process in which H particles collide and form He.
  4. 4. which planet is a dwarf planet?
  5. 5. what type of star is the sun?
  6. 6. what does the acronym, My Very Educated Mother Just Served Us Nine Pizzas, stand for?
  7. 8. what is the 6th planet with over 60 moons?
  8. 9. which galaxy has no definite shape?
  9. 13. what type of galaxy is the milky way?
  10. 14. distance light travels in one year.
  11. 18. what is the average distance from earth to the sun?