People argue against the possibility of time travel by saying, "If humans will eventually be able to travel back in time, then where are all the tourists from the future?" This idea is similar to
The ________, only applied to time travel instead of alien space travel.

Question

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The Fermi paradox questions why, if extraterrestrial life is common in the universe, we haven't observed any evidence of it. Similarly, the argument against time travel questions why we haven't observed any time travelers if time travel is possible.

People Argue Against the Possibility of Time Travel by Saying