Can Traveling into the past really change the future? [duplicate]

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• Is Time travel in “Star Trek: Enterprise” totally illogical? 1 answer

Remembering one of two Original Star Trek series, Spock said that the past couldn't be change, Yet in the other one a science ship mate made it back to the time of WW II and the Enterprise was No longer there in there time on that planet that had a Rock WormHole.