It deals with the impact of technology and science on humans, humanoids, or aliens. Science fiction similarly takes the real world as we know it today, with all its facts and natural laws, as its first postulates. Hence, speculation is engaged in and this speculation is always about the possibilities of the real world. The worlds that science fiction creates may be fantastic in result, but these worlds are not pure fantasy in themselves. As a genre, science fiction has always had to fight for credibility.
Most statistics say that only one in every two people like or even tolerate it.
Historically, the audience for science fiction has been further limited in its appeal being largely to young males. Some credit for this limited audience is owed to science fiction's history in Hollywood. Finding a successful motif means replicating it ad infinitum , producing cookie-cutter copies until the idea is exhausted and the market is saturated. Hollywood did this early on with the Western. Once that genre was sufficiently worn out, movie producers turned to science fiction, essentially blending the two.