Science fiction horror is when scary things happen in stories that take place in space, future worlds, or when science is used to create horrors. Do you like aliens, robots, or future technology? Well, sometimes they can become really scary in science fiction horror stories.
Think of a story about astronauts on a spaceship that suddenly starts to malfunction and strange creatures start to appear out of nowhere. Or, imagine a creepy lab where experiments are run on humans and the results go horribly wrong. These are just examples of science fiction horror.
People love science fiction horror because it gives them thrills and scares that they wouldn't find in the movies or books that take place in real world. It's like a mix of science fiction and horror movies all rolled into one, and it can be really exciting!