Science fiction is difficult to define, as it includes a wide range of subgenres and themes.
Hugo Gernsback, who was one of the first in using the term "science fiction", described his vision of the genre: "By 'scientifiction' I mean the Jules Verne, H. G. Wells and Edgar Allan Poe type of story-a charming romance intermingled with scientific fact and prophetic vision."[REF] .