Besides, anyone who has seen that old Gregory Peck/Gene Hackman movie Marooned knows that even the best film special effects available in 1969 couldn't convincingly fake space travel. (Marooned won the visual effects Oscar® that year).
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I agree the moon landings weren't faked, but as to your SFX comment, there was this little movie released in 1968 you may have heard of. It's called "2001: A Space Odyssey." Those FX were beyond impressive.