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The unique thing of Apollo 11 was that it was the first spsce mission to fly to the moon and land on it. And also to bring the astronauts safely back to the earth.
The song playing throughout much of the "Limbo"episode is "Looking For Space" by John Denver from his 1975 album "Windsong." Great song and great album. After this episode aired they decided to do one more season. The song is called "Looking for Space". It can be found on most of his greatest hits and anthology-type cd's.