Black holes

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Across
  1. 4. cosmic system of matter
  2. 6. mass of the sun
  3. 10. point of no return
  4. 11. our galaxy
  5. 13. stimulates sight
  6. 15. center of the milky way
  7. 16. physical substance
  8. 17. tunnel between 2 black holes
  9. 18. speed of light
  10. 19. transmission of energy
  11. 20. the universal force
Down
  1. 1. the flow of energy at universal speeds
  2. 2. region of space with gravitational attraction
  3. 3. giant stars die in supernova
  4. 5. union of space and time
  5. 7. can't escape from it
  6. 8. 2 stars orbiting a common center
  7. 9. german born theoretical physicis
  8. 12. the dimensions of height depth and width
  9. 14. powerful steller explosion