Big Bang theory Crossword Puzzle

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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