Presentism holds that neither the future nor the past exist - that the only things that exist are present things, and there are no non-present objects. Some have taken presentism to indicate that time travel is impossible for there is no future or past to travel to; however, recently some presentists have argued that although past and future objects do not exist, there can still be definite truths about past and future events, and that it is possible that a future truth about the time traveler deciding to return to the present date could explain the time traveler's actual presence is the present. This view is contested by another contemporary advocate of presentism, Craig Bourne, in his recent book " A Future for Presentism" although for substantially different (and more complex) reasons. In any case, the relativity of simultaneity in modern physics is generally understood to cast serious doubt on presentism and to favor the view known as four dimensionalism (closely related to the idea of block time) in which past, present and future events all coexist in a single spacetime. (Taken from: Wikipedia.org)
time travel, traveling, future & past, back to the future, time machine
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