I was thinking the other day about favorite SF/ fantasy tropes and I thought it would be fun to make a list. Everyone likes a good list, right? So I thought I'd narrow it down and share an example for each one of a favorite book that embraces that trope. Little did I know how many books I would end up looking at- and how many intriguing reads I would find. I may have to do this for fantasy as well, but for now here are my top SF tropes.
Time/ Space Gates
There are a lot of examples of this trope but my favorite probably has to be this series. A four book series (helpfully collected in this omnibus) about a woman named Morgaine and her loyal companion who must travel from world to world, closing the world gates that are disrupting space/ time.
Galactic civilization/ long lost colonies
Parallel worlds/ alternate realities