SCI-CrossWord Puzzle

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Across
  1. 1. the largest planet in the solar system
  2. 3. the sideways planet
  3. 6. the smallest planet
  4. 7. the twin planet of Earth
Down
  1. 2. the planet where we live in
  2. 4. the blue planet made up of methane
  3. 5. the center of the solar system
  4. 6. the red planet