Expert Brain Twister!

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Across
  1. 3. The 1st Black congresswoman, ___ Chisholm
  2. 8. Jabba the Hut is killed by?
  3. 9. Al Gore: senator from?
  4. 10. Author of "The Republic"
  5. 12. A metal that's liquid at room temperature
  6. 13. Chewbacca is one
  7. 14. Leia Organa, portrayed by Carrie ____
  8. 16. Him "Fear is the path to the dark side" spoke
  9. 19. The whole planet is rust (iron oxide)
  10. 21. Pilgrims' cargo ship
  11. 22. The only president to resign from office
Down
  1. 1. This country produced the 1st female president
  2. 2. The ancient Babylonians developed this math
  3. 4. The 1st American state
  4. 5. Luke Skywalker's home turf
  5. 6. Declaration of Independence author
  6. 7. It is lighter than air
  7. 11. 1st female Nobel Prize winner
  8. 15. 1st Treasury Secretary of the US
  9. 17. This Skywalker built C3PO
  10. 18. a.k.a. dihydrogen monoxide
  11. 20. Our stellar nuclear reactor