On Time Travel
22 06 2008I am reading H.G. Wells’ The Time Machine, which has got me thinking about the manifold paradoxes of time travel. Supposing that it were possible to travel into the future, any actions therewith taken become null and nonexistent the moment the traveler returns to his own time, for in his own present the future has yet to blossom. If, peradventure, the traveler advances just one year into the future, steals and destroys the Mona Lisa, and returns to his native time, the painting will still be secure in the Louvre upon his arrival because he has not yet desecrated the masterpiece.
Suppose now that you are visited by a time traveler from the past. For the sake of simplicity, let us assume that you had no foreknowledge of his arrival. The time traveler appears, shakes your hand and introduces himself, then returns to his present and your past. Aside from the singularity of such an encounter, your own reality has not been affected so much as a pin. Your life continues. Time keeps flowing. You still exist. By this same principal, an arbitrary future visited by a time traveler will continue to exist even after the traveler returns to his home era. By extrapolation, all eras of time exist simultaneously: not only the past, present, and future, but every single day, hour, minute, and second. As the units decrease (for it is assumed that a time traveler can choose any possible time), they near the infinitesimally small. We surmise, therefore, that there are infinite planes of time, arranged in the fourth dimension much like a line is arranged in two dimensions. However, if each moment is its own, discrete plane, how are we to account for the passing of time — the merging of planes? Does one plane become its successor, as it is replaced by its precursor? Even if we diagram time as a linear progression rather than a series of planes or points, we must remember that a line is made up of an infinite number of points. And it is mathematically agreed upon that a point occupies no space — and therefore neither does a line, and therefore such planes cannot exist.
There is yet another paradox borne from traveling into the future, which I will expound ignoring the impossibility of different planes of time. If the same time traveler who had gone one year into the future to destroy Da Vinci’s magnum opus had returned to his present and, rather than time travel again, remained inactive until the future he visited became his present, two realities would exist at once: the first being the passive reality, in which the Mona Lisa remains untouched by the traveler, the second being the active reality, in which the traveler has destroyed the painting. The French police would be looking for the man who destroyed a painting that rests safe in the Louvre. This is based, of course, on the previously discussed necessity of all times existing at once. It adds, however, a complication: all possible times exist at once, meaning that each specific location in time has an infinite number of duplicates, all different in some way or other.
Moreover, anyone who travels into the future arrives in a reality in which his arrival is known. If he sets off anywhere but the most furtive hiding place, the audience he attracts will remember his departure into the future, will immortalize it in the papers, on television, and in history books. The people of the future, having such knowledge, will be utterly aware of the exact time and location of his appearance, and, if they have not developed a time machine themselves, will ravage the traveler the instant he becomes a part of their time, in order to steal his machine away from him.
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