Flight to the moon was beyond reach in 1943, but it was clear that it’s possible to do and what technologies need to be developed. This later was done at great

Flight to the moon was beyond reach in 1943, but it was clear that it’s possible to do and what technologies need to be developed. This later was done at great expense. We are in the similar situation now, we know what needs to be developed, it’s just very expensive and we can’t (and should not) mobilize entire earth population to pay for it. If we do, we can colonize nearest star systems in few thousand years and Milky Way in couple million.