The Big Bang Theory

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Across
  1. 3. Fireball
  2. 5. Bang Theory (Model)
  3. 6. Fusion
  4. 9. Matter
  5. 11. (First Law)
  6. 13. Density
Down
  1. 1. Shift
  2. 2. Space Telescope
  3. 4. Forces
  4. 5. Hole
  5. 7. (shape)
  6. 8. Lines
  7. 10. Background Radiation*
  8. 12. Era