Science crossword puzzle

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Across
  1. 3. 4th planet from the sun
  2. 5. planets are made of gas
  3. 6. of an object
  4. 8. orbits earth
  5. 9. push or pull
Down
  1. 1. the top of the earth
  2. 2. of an object
  3. 3. of an object
  4. 4. big ball of gas
  5. 7. home planet