CBO crossword

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Across
  1. 2. alignment of the optical elements in an instrument
  2. 4. usually blue but we prefer it black
  3. 5. Pluto is not one of these
  4. 7. telescope that uses mirrors and lenses
  5. 9. the first element on the periodic table
  6. 12. a piece of glass that bends light
  7. 16. an astronomers favorite time of day
  8. 17. bigger is better
  9. 18. The next star to explode in our galaxy
  10. 19. a group of stars that looks like something
  11. 21. my telescope is ________ saturn all night!
  12. 24. the study of the stars
  13. 25. Earth ______ on its axis
  14. 26. what you use to take a picture of the night sky
  15. 27. the bane of an astronomer's existence
Down
  1. 1. Schmidt and ________ made a telescope
  2. 3. an astronomer's favorite tool
  3. 6. the most beautiful pictures come from _______ (we aren't biased)
  4. 8. the elliptical rotation of two astronomical objects
  5. 10. telescope that uses mirrors
  6. 11. telescope that uses lenses
  7. 13. useful filters for deep sky imaging
  8. 14. a very reflective surface
  9. 15. space snowball
  10. 16. orion has one of these in its sword
  11. 20. 99.99% of the mass in our solar system is here
  12. 22. giant cluster of stars and gas
  13. 23. some of Jupiter's moons are named after him