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There is no greater limitation on our species, than the limitations we face when perceiving how limited our perception actually is. We are creatures of an entropic universe, like microscopic organisms that live and die in the upper half of the dwindling sands of an hour glass. As far as we can perceive, the arrow of time points in one direction only. We, like everything we have ever known with what senses we possess, are always and seemingly infinitely the products of something else. The organic life that exists now has reproduced and replicated itself since a time we would call the ‘beginning’ of the bioorganic world. The formation of perceivable matter, we attest to the amalgamation of microscopic particles after the Big Bang. The further back we travel however, speculating some origin of the universe, our imaginations begin to fail us. The limitations of our comprehension and understanding of the ‘grand scheme of all things’ begin to show, like cracks in a façade.
To our general human understanding, everything that ever is, was, or will be, must have or had, a beginning of some sort. When we apply this concept to the ever expanding universe in which our species resides, we are faced with a perplexing thought. We are told that the Big Bang is the moment that both time and space came into existence, that the cause was/could have been a totally random event. But for any catalyst to occur, of any magnitude, something had to have happened. Thus the waters begin to grow increasingly murky. In lieu of our universe, in the absence of this ‘reality’, what is/was there? If anything at all? If our universe did not exist, whether or not there is or isn’t anything beyond, we are for the most part, utterly incapable of imagining what continues to ‘go on’, wherever/whenever that may be.
Approximately 13.8 billion years ago, our comprehensible universe in its entirety existed in a fraction of time and space many, many times smaller than a single atom. Some have theorized the existence of parallel universes, a direct ‘shadow universe’ (connected/veiling our own and connected by gravity since and attributing to the beginning of our universe) and an entire multiverse linking/spawning universes and or dimensions. One theorized means of connecting two isolated points in space and time, universes, or junctures throughout the multiverse are naturally occurring ‘wormholes’.
Science-fiction has taken many liberties with the concept of the wormhole, suggesting that they are assuredly shortcuts through the curvature of space-time and traversable by forms of life (often with the aid of highly advanced technology). When in truth, for the most part, we can only speculate and hypothesize. Usually when it’s suggested that a wormhole could be used to travel billions of light-years in a short amount of time, it’s because it is believed that space-time bends and folds. But between folded points, like a folded piece of paper, an entry/exit hole exists (wormholes) cutting through billions of light-years of otherwise linear distances.
It’s one thing to discuss the function of wormholes and the possible use to traverse points in space and time in our own universe, but it is somewhat more controversial (or fictitious) to suggest the notion that wormholes could link parallel universes, dimensions or the multiverse entirely. When entertaining the idea that there could be arguably traversable links between our universe and the multiverse, a great many questions arise. Time is considered the fourth dimension in our universe, but higher dimensions and theoretical qualities of the multiverse transcend time. So would it be possible for a wormhole to form (by some hypothetical means) between our universe at a point in time when the date on earth was the 4th of September, 1772 and a region in the multiverse independent from time. The wormhole opens for a duration of exactly 9 seconds before vanishing in our universe, but in the multiverse it remains perpetually open and infinitely linked to the 4th of September, 1772 during a 9 second period.
Then in the earth year 7772, another wormhole appears in our universe, linking to the multiverse, relatively close to the constant wormhole that is still connected to the 9 second window in the year 1772. Now the hypothetical paradoxes begin to arise. Imagine, an advanced form of life (ultraterrestrial, extraterrestrial) learns of the existence of countless wormholes, throughout universes and the multiverse to travel where and when it wants, anywhere imaginable at the speed of light. Only one day, it happens to go through the same wormhole twice, that links to our universe on the 4th of september, 1772 for 9 seconds…
During the 9 second window, the advanced being had already once passed through and been present. So theoretically, upon this loop around, returning to the same wormhole, the advanced being would witness its former self embarking on its prior journey. Only, shouldn’t have it seen its future self appear simultaneously upon its original arrival? What if, the second craft was ill fated and another being wanted to warn it to avoid catastrophe. Immediately, during the 9 second window in 1772, three crafts would exit the wormhole. Two identical crafts and one third, warning them of their misfortune. All three navigate wormholes home, but now there are two replicates of the same being, one several hours (relatively) older than the other returning to their home world?
What if someone in 7772 designs an explosive of planetary proportions and sends it through the wormhole channels, that lead back to the 9 second window in 1772 and the explosion consequently destroys planet earth? Some might suggest that the future would cease to be the moment its past was eradicated. But others believe that theoretically, time trajectories are entirely independent. Meaning where we are in this juncture of time and space, is entirely separate to any hypothetical alterations to the past. So even the concept of going through the wormhole and seeing a former self may be impossible, because the point you pass into this universe/dimension is 0.00 for both parties. Only if there was a time variation for one to arrive at 0.00 and one at 0.01 or less, would they occur in the same point or trajectory in time and space. Because time is relative, not absolute, especially in the sense of a multiverse transcending time, it creates a paradox of epic proportion.
Our interpretation of time and inter-dimensional travel is limited by our experience. While most people agree time travel, especially traveling backwards through time is utterly impossible, even if it were theoretically achievable, we often struggle to fathom what implications could/would arise from it. Could you return to a specific point in time, to pick up one dollar from the side of the road, over and over and over again? Appearing at 6.00 AM on the dot each time, returning again and again as your pocket fills with dollar coins. Or would you return once and be fighting over the first coin with yourself?