The Economist has published a list of the most popular conspiracy theories (as measured by Google searches), which I thought might interest y'all. While they have to yield first place to 11th September conspiracies, space-related CTs make a good showing with the Apollo moon hoax, Area 51, and reptilian aliens making the top ten.

link

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Far out in the uncharted backwaters of the unfashionable end of the western spiral arm of the Galaxy lies a small unregarded yellow sun. Orbiting this at a distance of roughly ninety-two million miles is an utterly insignificant little blue green planet whose ape-descended life forms are so amazingly primitive that they still think digital watches are a pretty neat idea.