Astronomy Crossword Puzzle

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Across
  1. 2. first person to focus the telescope to the heavens
  2. 8. first artificial Earth satellite
  3. 9. movement of a planet on its axis
  4. 10. famous comet
  5. 12. group of stars forming patterns
  6. 14. region with such strong gravitational force
  7. 16. size of the sun
  8. 17. moon of Saturn
  9. 18. "Great Bear"
  10. 20. type of galaxy
  11. 21. named after the Roman god of love and beauty
  12. 22. Poseidon
  13. 23. moon of Jupiter
  14. 26. leading theory about the origin of the universe
  15. 28. universe
Down
  1. 1. moon of Mars
  2. 2. first man on space
  3. 3. meteoroid which falls to the ground
  4. 4. all the matter and energy and contents of space
  5. 5. highest mountain in the Solar System
  6. 6. copernican
  7. 7. someone who studies astronomy
  8. 11. a dwarf planet
  9. 12. Saturn
  10. 13. first animal to orbit the Earth
  11. 15. nearest galaxy to the Milky Way
  12. 19. ringed planet
  13. 24. Hades
  14. 25. brightest star in the Earth's sky
  15. 27. collection of gas, dust and billions of stars