big bang

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Across
  1. 3. system of billion stars
  2. 4. complete turn
  3. 7. study of the universe
  4. 9. includes space and all matter
  5. 10. big bang: universe created by huge explosion
Down
  1. 1. shift: change in frequency
  2. 2. year: a unit used to measure light
  3. 5. curved path around something
  4. 6. system: the sun and the planets that orbit
  5. 8. law: redshifts in the spectra