The techniques employed by science fiction writers are meant to draw the reader into a world where extraordinary events can occur and unexpected scenarios draw a striking comparison to events which mirror our everyday real life experiences. So good science fictions needs to stay within the limits of what may one day happen, at the same time science fiction writers need to stay away from the genre of fantasy paint a scenario which will never occur.
Readers of science fiction expect to be exposed to a world different from our own， but in which certain physical rules and laws still apply. In addition, any plot as part of a science fiction novel or story needs to mirror events which are familiar to many of us, IT may include the universal ideas of hope and loss. Association with real life events helps the author maintain the suspension of disbelief without which a science fiction story becomes unrealistic and in fact an insult to the science fiction community."