Science fiction is largely based on composing rationally about alternate possible worlds or futures. It resembles, but varies from fantasy in that, within the context of the story, its imaginary elements are mostly possible within scientifically established or clinically postulated physical laws (though some aspects in a story may still be pure innovative speculation). Read Far more - http://free.yudu.com/item/details/2007329/Science-Fiction-and-its--impact-to-society