alternate future

In science fiction stories involving time travel, an alternate future or alternative future is a possible future which never comes to pass, typically because someone travels back into the past and alters it so that the events of the alternate future cannot occur.An alternate future differs from alternate history in that alternate history usually speculates on what might have happened in the past if some events in the past had occurred differently, while an alternative future usually speculates on what might happen in the future. Also, alternative histories commonly forgo time travel, while alternate futures do not.
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