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Across
  1. 6. closest to our sun
  2. 7. our star
  3. 8. dark during the day
  4. 9. Zeus as a Roman god
Down
  1. 1. a candy bar
  2. 2. the blue planet
  3. 3. the red planet
  4. 4. "the" dwarf planet
  5. 5. the warmest planet
  6. 8. the most moons