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Because it costs a lot of money and we don't really benefit from trips to the moon. It's not like there are valuable resources or information that we can gather by successfully landing there. Not to mention, there are risks to human life involved every time that you send a person into space, especially on such a long journey.

More succinctly, it's wasteful to human resources.

Or because we were just way smarter back in the 70s, with better technology.

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