Comment Re:SF: only one impossibility per story (Score 1) 495
Hard Science Fiction is a pretentious myth; it always rests on one thing: the assumption of its day.
Not only do all the authors you mention have stories where part of the future leaves the realm of known science to an extent that is sometimes as bad as Trek's, but where they stuck to what was known in that day, they end up looking incredibly outdated, with Asimov's multiple tons micros and Clarke's typewriting space-goers.