Since Galilee saw the seventeenth century mountaine in the mountains, people were forced to go there.
When Apollo's missions made the truth in 1969, the US space program began to assume a significant future month. In 1984, NASA's symposium on this subject was thought to be the beginning of the planning, thinking that the 2000 space transportation technology could be loaded every month.
Unfortunately, no country on the planet has been using space transportation technology capable of coming to the moon every month since 2000. Also, we did not know the true nature of the moon surface.