Being an insane over-analysis of one of my favourite sub-genres!
You know this story, you’ve seen it a million times. It’s two parts sci-fi and one part horror, and it owes its ancestry almost entirely to movies and later, videogames; its only direct literary ancestor would by the haunted house story. Usually taking place in the future, the story will feature a group of humans (often military) who either stumble upon or are sent to investigate a mysterious space ship, space station or remote colony or outpost of some sort. At first it seems as if the place is deserted. There will be no signal and no response to any attempts at communications. There may be some evidence that the previous occupants came to a sticky end. The characters will wander around in the dark with flashlights. Sooner or later, they will encounter whatever it was that killed the original crew, and things will get nasty. It’s often aliens, zombies, ghosts, demons, or some combination of the above. Depending on the ratio of horror to sci-fi, members of the team may be killed off one-by-one, or they may fight the threat outright.