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the most common science fiction themes are those of possible alternate realities future words,
and of characters that have abilities beyond those of ordinary humans.contact with aliens is alsocommon in this kind of literature,and many sci-fi books explore ideas of how life would change if humans met with aliens.
the plot of a science fiction novel can often cause readers to question what could be possible beyond the current world.
stories of alternate realities usually explore the nature of time itself and also raise question ofhow much characters may, or may not, have control over what happens in their futures.
science fiction themes about alien contact are frequently among the most popular stories. many of these describe worlds where humans live alongside alien races that have equal or
often superior intelligence. some explore how humans coud overcome their shortcomings with
the help of aliens, and others detail the human race fight against an alien theart.
other sci-fi themes concern the limits of the human mind. characters inthese stories often have abilities such as telepathy.
a science fiction story set in a future world often raises ideas of where certain decisions and
actions will eventually take the human race. a story about a bad world often serves as a warning about the present. a science fiction story concerning a good world often presents
a much more optimisic view of the human race.最后,班级群比百度可靠