Astronomy Crossword Puzzle

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Across
  1. 4. famous comet appearing every 76 years
  2. 7. "ringed planet"
  3. 9. heliocentric
  4. 11. first man on space
  5. 14. first artificial satellite ever launched
  6. 17. highest mountain in the Solar System
  7. 18. a type of galaxy
  8. 20. movement of a planet on its axis
  9. 21. meteoroid which falls to the ground
  10. 23. rocky body too small to be called planet
  11. 24. natural satellite of the moon
  12. 25. a moon of Jupiter
Down
  1. 1. size of the Sun
  2. 2. moon of Mars
  3. 3. brightest star in the Earth's sky
  4. 5. first person to focus the telescope to the heavens
  5. 6. named after the Roman god of love and beauty
  6. 8. a constellation meaning "Great Bear"
  7. 10. group of stars which forms imaginary patterns
  8. 12. nearest galaxy to the Milky Way
  9. 13. someone who studies astronomy
  10. 15. all the matter and energy and contents of space
  11. 16. leading theory about the origin of the universe
  12. 19. universe
  13. 22. collection of gas,dust and billions of stars