solar system crossword puzzle

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Across
  1. 2. A force that pulls things down
  2. 4. this planet has 7 rings
  3. 8. a model of the universe which earth is at the center
Down
  1. 1. a model of the solar system
  2. 3. This is the largest planet
  3. 5. the average distance between planets
  4. 6. A path an object takes
  5. 7. This is the star of the solar system