Science Fiction Genres

-Apocalyptic and post-apocalyptic science fiction

-Biopunk (uses elements from the hard-boiled detective novel, film noir, Japanese anime, and post-modernist prose to describe the nihilistic, underground side of the biotech society)

-Dying Earth science fiction

-Military science fiction

-Mundane SF

-Steampunk (denotes works set in (or strongly inspired by) an era when steam power was still widely used — usually the 19th century, and often set in Victorian England)

-Time travel

-Space colonization

-Space opera (emphasizes romantic adventure, exotic settings, and larger-than-life characters)

-Spy-fi


Sources:
http://en.wikipedia.org/wiki/Science_fiction_genre