Hyperspance, phasers, interpersonal communications, intelligent machines were the tools of the science fiction craft used to tell a story.
Galactic travel allowed for a universe of worlds to be created and explored.
When Roddenbury produced StarTrek he successfully created a franchise to go where no man had gone before. On TV at least.
At the 1939 World's Fair "World of Tomorrow' was very popular.
Economically feasible? Certainly not by government.
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