The Big Bang theory

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Across
  1. 5. The theory for the origin of the universe
  2. 7. eruption
  3. 8. The galaxy include the solar system
Down
  1. 1. as a result of the force of gravity
  2. 2. atomic beam
  3. 3. symbol is H
  4. 4. Cosmic space
  5. 6. symbol is He