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 Planetary Observer program - Definition 

NASA's Planetary Observer series was still birthed, resulting in only one, failed, mission.

  1. Mars Observer
  2. Lunar Observer (LO) - Proposed 1997 launch, would have been sent into a long-term lunar orbit, at 60 miles above the moon's poles.
  3. Mercury Observer (MO) - Proposed 1997 launch.
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