staer

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Across
  1. 3. the first of its kind
  2. 6. expensive
  3. 7. how big
  4. 8. element
  5. 11. home
  6. 13. boom remnants
  7. 14. north star or something
  8. 16. that science word
  9. 17. scary
  10. 18. pins you to the ground
  11. 21. speed of light and time
Down
  1. 1. ISs?
  2. 2. group of stars make image
  3. 4. the void
  4. 5. constellation and closest galaxy
  5. 8. telescope
  6. 9. research machines
  7. 10. galaxy
  8. 12. star system
  9. 15. WEEE FUN RIDE
  10. 18. big spinny thing
  11. 19. most aren't habitable
  12. 20. gassy