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Monday marked 46 years since the Apollo 11 moon landing, and Nasa has this week been sharing images of the historic moment.
Almost half a century on, however, there are those who somehow believe the whole thing was faked (seriously, just search for 'moon landing hoax' on Twitter).
For those people, Professor Brian Cox has a message, a simple one at that:
This message even reached Buzz Aldrin:
And lest we forget what happens if you tell Buzz Aldrin that the moon landings were just one big hoax...