It is quite easy for a Sci-Fi author to make their aliens very human-like (guilty of charged– as in my upcoming novel, Silversides); trying to write a story where they are nothing like humans creates a lot more work for the author, even if that alien does not have a speaking part.
Both of my novellas (November Seed & From Europa With Love) have aliens that are not human-like and have no dialogue, so to make these stories credible, the biology has to be right. It helped me immensely that in my former life I was a Marine Biologist–I had been studying alien life forms my entire life it seems and it is not by coincidence that in both my novellas the alien life forms are marine in nature.
But if you are new to writing Sci-Fi and do not have a background in Marine Biology, there are countless videos like this excellent BBC short from the BBC Ideas section to start you on your way.
So where does a new writer of Sci-Fi get started with understanding alien life? Below are some good short video to get you on your way. maybe, just maybe will will find out in our lifetime when we can get a probe below the surface of Europa to explore its thermal vents…. but then again, maybe we do not want to go three. Europa seems to be a focus for NASA and other scientists as a first strike for alien hunting. And why not? t was mine in From Europa With love.