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Across
  1. 1. Revolves around the earth.
  2. 4. Closest planet to the sun.
  3. 6. Fifth planet from the sun.
  4. 7. Earth revolves around it.
  5. 9. There are 7 of these.
  6. 10. Second planet from the sun.
Down
  1. 2. Farthest planets from the sun.
  2. 3. We live on this planet.
  3. 4. Astronauts would like to go to this planet.
  4. 5. These are the closest planets to the sun.
  5. 8. Seventh planet from the sun.