The starships left with the optimism. In the 50s there was a greater demand for stories with an unconstrained vision of the future where growth and expansion amount to flourishing. Later generations that lived in the excesses of growth saw it as the source of an intensifying dystopia. They stood athwart history and demanded decelleration. Star Trek lost ground to Terminator, Foundation to Neuromancer. Escaping sidewa…
Also, we've realized the scientific reality that traveling faster than light is likely impossible, and the vast distances to other habitable planets would mean tens of thousands of years of travel even with the most efficient technology. Interstellar space is also hostile to life, and any life present at the destination will not use the same DNA coding for protein (if gene expression even works that way). We also do…
* Space Station that lasts 25 years
* 3,000 satellites providing Internet Service
* Mars rovers that run for 10+ years
* Flying helicopters on Mars