Big bang

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Across
  1. 1. what the universe is full of
  2. 4. leftover energy
  3. 5. one of the first important elements
  4. 8. planets moving toward us
  5. 9. what our world is
Down
  1. 2. planets moving away from us
  2. 3. Radio and microwave radiation are apart of this
  3. 6. what is moving away from each other due to big bang
  4. 7. one of the first important elements
  5. 10. background static found in radio observations