formation of the universe

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Across
  1. 2. the internal energy of an object created by the random movement
  2. 6. study of the origin, structure, and future of the universe
  3. 7. eternal return
  4. 8. the theory that the universe began with a tremendous explosion
Down
  1. 1. a collection of non-stellar celestial bodies
  2. 3. when the universe expanded explosively
  3. 4. blowing apart of something
  4. 5. the action of becoming larger