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This Question was closed for various reasons. For people looking for the answer to similar question, please see this link. I believe this is a solid answer to my question.

As the designated Space Cadet of my friends, I often have people come to me with questions regarding Outer Space. The most recent call came from a friend who was being aggressively told that the Moon landing was fake.

Now, we all know this is a conspiracy. In fact, conspiracy isn't actually the correct word per the definition. It's simply an incorrect claim. On top of this, we all have our return arguments to those who doubt the Moon landing. But I think anyone who has been in this argument has run into the typical conspiracy theorist issue:

As soon as you prove one claim to be false, they hit you with another that you need to fight against.

So, here is the question I ask all of us to think about:

What is a single fact/argument that completely debunks the claim that the Moon landing was faked?

(Emphasis on single fact/argument)


Disclaimer: I know that technically it isn't up to me to prove that the landing wasn't fake, but rather up to them to prove to me that it was fake. However, I still want to help people learn and be educated, so I would love some thoughtful answers to this question. Plus... I love a good argument (and I definitely love winning a good one too).

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    $\begingroup$ I’m voting to close this question because it is not even a little bit about Astronomy as defined in the help center. This is however somewhat on-topic in Space Exploration SE, and probably has answers there already. You can read about it in the meta site there: space.meta.stackexchange.com/search?q=hoax $\endgroup$ – uhoh Jun 11 at 8:11
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    $\begingroup$ Also when talking about debunking conspiracy theories, you're up against things like the backfire effect, which is more a question about psychology. $\endgroup$ – antispinwards Jun 11 at 8:18
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    $\begingroup$ More appropriate to Skeptics I think. But my experience is that people who deny e.g. the moon landings won't be convinced by anyone or anything. $\endgroup$ – StephenG Jun 11 at 8:42
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    $\begingroup$ Every now & again you will be involved in a argument/discussion/fight you will never will never win despite being correct. Some people aren't interested in facts &/or truth. They want to hold onto their ideas/opinions regardless of the consequences. Say what you know is correct & if the other person still holds incorrect ideas change the topic of discussion. Your sanity is worth more to you intact than the damage you might do trying to bash your head against a brick wall trying to convince someone else they are wrong. $\endgroup$ – Fred Jun 11 at 8:45
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    $\begingroup$ I’m voting to close this question because "when talking about debunking conspiracy theories, you're up against things like the backfire effect, which is more a question about psychology". There isn't an astronomy answer here. $\endgroup$ – James K Jun 11 at 8:52