But why haven't they made a return visit to the moon ??
A serious question? Why go back to somewhere when the rewards are known to be minimal at most?
Why send humans, with a considerable risk of failure, when robots can accomplsh the same at far less cost? That is why.
A lack of thought, or understanding, by the poster methinks! Or simmply some ulterior motive to unnecessarily arouse the suspicions of the 'don't really have a clue about science' brigade.
Horizons are far distant these days. 350k miles is chicken feed, compared with unmanned probes to asteroids, Pluto and other distant space objects. Satellites are able to collect and transmit data to scientists, who can safely sit in their offices and sift through the important findings.
The moon is simply made of green cheese. Not much benefit in mining green cheese for consumption on Earth, is it? Elvis has copyrighted all the interesting things on the moon, including laying claim to all the best bus routes, so Citybus have lost the desire to join the race ad the profitable routes are all taken. We know that wid turbines won't work too well up there too. Can you really think of any good reason to send more people to land on the moon?
Only a question from a non-thinker, I think!