The Spelling crossword

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Across
  1. 2. seeing if something is true or not
  2. 7. to mysteriously vanish
  3. 8. a formation of of the giant faraway suns we call "Stars"
  4. 10. something involving the planets, the sun, and the stars
  5. 11. a page at the back of a book which may explain what the book contains
  6. 12. not polite
  7. 13. the art of creating psyco machinery
  8. 15. a strange concept, maybe a machine
  9. 16. to leave to go someplace
  10. 18. something above
  11. 19. the feeling of sadness when something doesn't go as planned
Down
  1. 1. a task that is done on behalf of another human
  2. 3. someone who does math for a living
  3. 4. a place which may contain Information and models about the space and the solar system and the galaxy
  4. 5. a place where scientists may conduct experiments
  5. 6. when something leans or a stage of the moons spin cycle, waning crescent, waning quarter, waning gibbous
  6. 9. somthing involving the giant star we call "Sun"
  7. 14. a vessel used to travel trough space
  8. 17. something perfectly round, 3D as well
  9. 20. sometimes an ancient tale describing monsters and fantasy