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  1. Habitable Zone
  2. Often Mistaken For Absent
  3. Saturn
  4. Mars
  5. A view of a planet as it looms in close orbit
  6. Conceptual image of a scene in outer space
  7. Sun and its planets
  8. A ringed blue gas giant with shepherd moon in the rings
  9. A ringed planet in front of an odd starfield
  10. Artist's depiction of an Earth-like world with a large rocky moon orbiting
  11. The Phobos mission rocket prepares for approach to the martian moon