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If there were a time paradox, would current world destruction be immediate or gradual?

Asked by elbanditoroso (33174points) May 8th, 2016

Many science fiction movies make reference to the danger of a time paradox – that someone from the future comes back to the past and something is changed that precludes the the existence of the future that the time traveler came from.

Some films dealt with this by destroying all existence, while others talk about parallel universes.

If that were the case and some current action negated the future – would the destruction be instantaneous – gone in a fraction of a second?

Or would it be a gradual disappearance?

Would the people about to be destroyed know it?

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