Origins
I'm shure that you have met at least one person in your life that bileves that the moon landing was faked, but have you ever met someone who belivies that the whole moon was fake? Called moon-truthers, these people think that the moon is a projection, set up by the governments.
Why
I myself, am a moon truther. I think that the government faked the moon and moon landing because they wanted us to ignore our problems down here. One time, Donald Trump himself tweeted "the moon and moon landings are fake" before it was hastily taken down by twitter for "going against the codes of conduct."