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Across
  1. 3. the fifth planet from the sun
  2. 5. when they go out to space
  3. 6. fourth planet from the sun
  4. 7. it use to be a planet
  5. 9. sixth planet from the sun
Down
  1. 1. When a star explodes
  2. 2. the eight planet from the sun
  3. 4. the red planet
  4. 8. its a gas planet