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A or B Theory
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<blockquote data-quote="Kairos" data-source="post: 171589" data-attributes="member: 10263"><p>This all stems from the ancient division between Heraclitus and Parmenides. Heraclitus saw the universe as essentially a present moment that is constantly in flux. Parmenides rejected the very idea of change, and saw the universe as a static whole. To him, our experiences of past, present, and future are illusory. They all exist eternally, unchanging, and our experience of change happens because we do not experience the universe as it's whole. </p><p></p><p>The ramifications here of the Parmenides solution is that, while the past exists, nothing can really change. So.. if you could somehow travel there, everything you did in the past would be whatever happened in the past. You wouldn't be able to alter what happens because what happened still included you being there in the first place. In other words, it doesn't make any sense to posit a time traveler in period B deciding to travel to period A, where he historically was not present, and then using his machine to now be in period A. If he goes to period A, then he was there before he even decided to travel there in the first place. </p><p></p><p>The ramifications of the Heraclitus solution is that the past does not exist. Only the present moment exists. In order to travel to some place, it has to exist. You cannot travel to a place that does not exist. I cannot travel to Middle Earth. Nor can you. It does not exist. I can, however, travel to Newark or Danville. Those places are really, really shitty, but they exist, and though I have never been to either one, and hopefully never will travel to one, I know I can travel there. The same is true for time travel. You cannot logically travel to something that does not exist.</p></blockquote><p></p>
[QUOTE="Kairos, post: 171589, member: 10263"] This all stems from the ancient division between Heraclitus and Parmenides. Heraclitus saw the universe as essentially a present moment that is constantly in flux. Parmenides rejected the very idea of change, and saw the universe as a static whole. To him, our experiences of past, present, and future are illusory. They all exist eternally, unchanging, and our experience of change happens because we do not experience the universe as it's whole. The ramifications here of the Parmenides solution is that, while the past exists, nothing can really change. So.. if you could somehow travel there, everything you did in the past would be whatever happened in the past. You wouldn't be able to alter what happens because what happened still included you being there in the first place. In other words, it doesn't make any sense to posit a time traveler in period B deciding to travel to period A, where he historically was not present, and then using his machine to now be in period A. If he goes to period A, then he was there before he even decided to travel there in the first place. The ramifications of the Heraclitus solution is that the past does not exist. Only the present moment exists. In order to travel to some place, it has to exist. You cannot travel to a place that does not exist. I cannot travel to Middle Earth. Nor can you. It does not exist. I can, however, travel to Newark or Danville. Those places are really, really shitty, but they exist, and though I have never been to either one, and hopefully never will travel to one, I know I can travel there. The same is true for time travel. You cannot logically travel to something that does not exist. [/QUOTE]
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