Money, almost every reason things are done, not done, or done a certain way boils down to money.
In this case, they don’t have the funding that they had 50 years ago. It would be trivial (comparatively) to go to the moon if some agency had unlimited budget. But the question is why. Why do we need to go there? What would we gain that we don’t already know? How many billions of dollars are we willing to spend to ‘just do it again’?
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