universe-liberty-1st period

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Across
  1. 1. length distance between any two corresponding
  2. 4. all space and the matter space contains
  3. 5. year light travels through space 1 year
  4. 7. the transfer of energy through matter of space
  5. 8. large cloud of gas
  6. 10. center rotational center of a huge galaxy
  7. 11. radiation radiation consisting of electric
  8. 13. waves provide us with light
  9. 14. shift the change in wave length
  10. 17. the death of a large star explosion
  11. 19. electromagnetic waves
Down
  1. 2. spectrum electromagnetic waves
  2. 3. arms area of stars spread out from the center
  3. 6. data info from experiments
  4. 9. of light 300,000km/sec
  5. 12. between radio waves and infrared
  6. 15. lanes bands of dust
  7. 16. large grouping of stars
  8. 18. hole an object with more than four solar masses