pseudoscience
n//ˈs(j)uː.dəʊ.saɪ.əns//pseudovetenskap
(pejorative) Any body of knowledge that purports to be scientific or to be supported by science (or may appear to be scientific) but which fails to comply with the scientific method (or rather, is not true science). [from 1796]
Fictitious science as portrayed in science fiction.