astronomy crossword

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Across
  1. 3. entropy
  2. 4. event
  3. 6. asteroid
  4. 7. starless
  5. 10. cosmic
  6. 11. comet
  7. 13. pluto
  8. 14. nova
  9. 15. neutron
  10. 17. blackball
  11. 18. singularity
  12. 19. thermodynamics
  13. 20. radius
Down
  1. 1. rotation
  2. 2. metric
  3. 5. spacecraft
  4. 8. solar
  5. 9. galaxy
  6. 12. magenta
  7. 16. blackness