big bang theory

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Across
  1. 3. first particles
  2. 5. everything there is
  3. 6. second most common element
  4. 8. leftover radiation from the universe
  5. 9. one of the most common elements
  6. 10. start of the universe
Down
  1. 1. clusters of stars
  2. 2. structure
  3. 4. light
  4. 7. chemicals