1. The Apollo Moon Landings
One of the top space conspiracy theories of our time would have to be the legitimacy of the Apollo Moon landing. Between 1969 and 1972, NASA said that twelve astronauts walked on the moon and released photos to prove it.
These photos brought to light many questions about their validity. The most common questions asked why there were no stars, why the flags seemed to be blowing in the wind, and why there were their footprints but no marks from lunar modules?
Of course, the answers to these questions could easily be solved, but some individuals are still convinced that it was still all staged.