switch two

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Across
  1. 2. not yet a star
  2. 4. invisible line
  3. 5. mars's nickname
  4. 7. rotates around us
  5. 8. breathable
Down
  1. 1. planets in order
  2. 2. little robot
  3. 3. were there
  4. 6. one of jupiters moons