“Computers, cell phones and CAT scans” all have had real economic benefits, required no government subsidies and were financed and developed by the market and consumer demand. “Moon village” of course will have no return on investment and will require the enormous taxation of the American people to build and maintain it. The truth be told the enormous expenditures spent by NASA other than weather and communication satellites have not resulted in the scientific and product cornucopia that its advocates predicted. BTW, given the laws of physics, aliens cannot visit us given the incomprehensible distances and man cannot “journey to the stars”.
Well here we go. First of all the three items mentioned came out of the Apollo program either directly or indirectly. However, you will not acknowledge that, preferring some other version of history written to your personal liking.
Sure there were computers when before Apollo but they filled rooms even whole floors. Apollo forced the start of the miniaturization and search for more efficient materials.
You can like, some other curmudgeons on FR, insist that nothing came out of any government research or NASA (which until the end of Apollo it was). But the list of things is long and easy to find.
You can go on believing that all the laws of physics are now known and settled like global warming. But you are now and ever will be in that tiny minority of humanity that fears the unknown and hates the very idea of spending resources to conquer it, will stop at nothing to prevent any advancement anywhere in anything.
You need to understand that all we know of the entire electromagnetic spectrum comes from Oliver Heaviside’s rewriting four of Maxwell’s 200 field equations in the 19th century. The other 196 Heaviside declared as abomination and have remained obscure ever since. Those other equations describe ideas that are only seen in scifi novels, but any alien could have easily mastered - as could we, if it were not for extreme prejudice found in attitudes toward exploration as you seem to espouse.
So no it is not impossible - just more difficult to go from one star to the next or one galaxy to another - those are not unimaginable distances except for those lacking said imagination. But then you have made the pronouncement from your basement and we all bow to you infinite wisdom, far-nearsightedness, intimate knowledge of the laws of the universe, and in particular, the physics that operate here on Earth.