Astronomy Crossword Puzzle

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