SARAH HOYT: Give Me Back My Spaceships and Dinosaurs.

We’re writing to set our minds and hearts free, to explore and roam places yet undiscovered. They might be strange places like… ancient astronauts, or as pulpy as I suspect the Shores of Kansas will turn out to be. In their ability to pit man against the dinosaurs of the ancient past or the aliens of the distant future, they tell stories only science fiction can tell. All it needs is the barest thread of verisimilitude, absent from fantasy. We know that sorcerers are imagined, but time travel, who knows? It might be real and we just having figured it out yet.

I have a collection of many hundreds of science fiction books dating back 60 or more years that I keep rereading for exactly Hoyt's reasons.