Our Universe

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Across
  1. 2. space and all the matter and energy in it
  2. 5. force of attraction between objects
Down
  1. 1. theory of how the universe was created
  2. 3. burning ball of gas and dust held together by gravity
  3. 4. the birthplace of stars
  4. 5. collection of stars, gas, and dust held together by gravity
  5. 6. the average distance between Earth and the Sun