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The main reason is because the Lunar Module was so small that it only held 2 people. The other reason was in case the Lunar Module failed to reach orbit after liftoff form the surface of the moon, a third astronaut would be needed to go down and rescue the 2 stranded astronauts. A major bonus of having a 3rd astronaut in lunar orbit is he was able to make observations and take photos while the other 2 were exploring the surface. In terms of lunar geology, you need both a closeup analysis and an overall picture in orider to figure out how the area formed.

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12y ago

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