Into Space!

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Across
  1. 3. The planet we live on
  2. 5. The farthest planet from the Sun in the Solar System
  3. 6. The biggest planet in the Solar System
  4. 7. The second closest planet to the Sun in the Solar System
Down
  1. 1. A person who studies about Space
  2. 2. The 'Red Planet'
  3. 4. It's known for its rings that surround it
  4. 8. The center of the Solar System