The planets

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Across
  1. 2. First planet
  2. 5. "Bull's-Eye Planet"
  3. 7. "Big Blue Planet"
  4. 9. "Ringed planet"
Down
  1. 1. Roman goddess of love and the Second planet
  2. 3. Biggest planet
  3. 4. "Red planet"
  4. 6. Former ninth planet.
  5. 8. "Little blue marble"