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Time is indefinite continued process of existence and events that occur irreversibly in an order of succession from the past through the present to the future which is again indefinite. Time is sometimes referred to as the fourth dimension. The first three being a line segment, a square where two line segments parallelly connect each other, a cube where two parallel squares connect each other and a tesseract where two parallel cubes connect each other.

Time is rigid. It cannot be changed. But why is it that every people on this planet has one question in their mind, from the last few decades, somewhere tossing on their mind that- "Can it be changed".

Some think that time is nothing but a constant whereas some think it to be an illusion of dimensions.

So what is time, actually?

Have you ever just stopped for a moment in your life just to think that why are we born and why are we different from each other and how are we connected to each person on this planet? How did we come into existence? How was this whole universe formed? What was there before the Big Bang?

Many questions but very few answers. Some might already be known to you and some you might think to be foolish explanations.

Well, you see, there was no before the big bang because before the Big Bang, Time did not exist Time is a result of the expansion of the Universe itself, but what will happen when the Universe has finished expanding... and the movement is reversed? What will be the nature of time?

Physicist Albert Einstein's theory of special relativity states that time slows down or speeds up depending on how fast you move relative to something else. If a person is approaching the speed of light inside a spaceship, he/she will age much slower than his twin at home. If String Theory is correct, the Universe possesses nine spatial dimensions and one temporal dimension. Now we can imagine that in the beginning, all the dimensions were twisted together and during the Big Bang, three spatial dimensions, the ones that we know as height, width and depth, and one temporal dimension, what we know as time, were deployed.

The other six remained minuscule, wound up together. Now, if we live in a Universe of wound dimensions, how do we distinguish between illusion and reality?

Time, as we know it, is a dimension we experience only in one direction. But what if one of the additional dimensions weren't spatial but temporal? If you mix the mashed potatoes and sauce, you can't separate them later.

It's forever.

The smoke comes out of the cigarette, but it never goes back in. We cannot go back. That's why it's hard to choose. You have to make the right choice. As long as you don't choose, everything remains possible.

Why does cigarette smoke never go back into the cigarette? Why do molecules spread away from each other? Why does a spilled drop of ink never reform? Because the Universe moves towards a state of dissipation. That is the principle of entropy. The tendency of the Universe to evolve toward a state of increasing disorder. The principle of entropy is related to the arrow of time. Entropy is a lack of order or predictability of something. A result of the expansion of the Universe. But what will happen when gravitational forces counter-balance the forces of expansion? Or if the energy of the quantum void proves too weak?

At that moment, the universe might enter its phase of contraction. The Big Crunch.

So what will become of time? Will it reverse?

No one knows the answer.

Now, gravity is said to have the power and the ability to bend time. Think of a trampoline and call it space-time. When anything having mass sits on that piece of stretched fabric which is evenly stretching more and more, it causes a dimple in the fabric or to say a bend in the timeline or the space-time. This bending of space-time causes objects to move on a curved path when anything traveling into space comes near to the bent space-time that this particular object has created. This curvature of space is what we know as GRAVITY.

Now, as we know that this universe is expanding then this means that someday or the other this bend has to get back to its original form. So can we say that it is going to happen in the near future?

Can we bend the space-time around us or can we measure its strength?

Space does not mean only outer space outside the atmosphere of the earth but it also applies to our planet.

We can't feel dimensions neither can we feel the space-time but we can say that we can feel time (but only theoretically). Practically that's not possible too because it's a part of the dimensional barriers that we have against time and gravity. We won't even have our own weights if there wasn't gravity. We can say that Sir Issac Newton has discovered and named the most tricky and mind turning concept called Gravity.

Now the greatest question comes to our mind that can we travel in time? All the concepts and all the theories wound up to just one center that attracts people and their minds to stop a while and think about it. What if we could just travel back in time and sought out the things we want now to be changed and what if we could travel ahead of time and see each and every outcome of our choices that we make today in the present...

Things that may strike our minds is HOW CAN WE DO THAT?

This cosmos is filled with varieties of different questions and we being just a part of this whole universe can answer only a few of them. We can't say that we are the only ones present in the universe to be having the living characteristics. It is so believed about the existence of other living beings maybe not in our dimension but in some other. Even GOD is considered to be living in the 6th dimension; 5th is the connection of two parallel tesseracts. Being able to see the future is a mere work of meditation but being able to actually teleport oneself to the distant past or the future can be challenging. Notwithstanding the fact that many scientists and physicists have already tried to build a mechanism and not a machine to alter spacetime. But still, it cannot be proved that it actually works. We all can remember our past as it had already been a part of our lives but what if we knew the future beforehand and could change our choices that we take today so that we can be happier in the future. Now, here comes the most prevailing topic of this universe -"THE PARADOX"

We all know about the famous grandfather paradox where a person travels to the past and kills their own grandfather before the conception of their father or mother, which prevents the time traveler's existence. Now there is no common origin of this and this is only one illustration that shows this paradox. Once this paradox takes place one can never know that it had already happened somewhere in the mere future or past.

There comes one more really mind-twisting and apparently longer paradox called "PREDESTINATION PARADOX". Here a man takes the whole initiative to be in a predestined path where he and only he can either initiate or stop it. This paradox is best illustrated in the movie "PREDESTINATION".

The film begins at a climax point as a time-traveling agent is trying to disarm a bomb that explodes and burns his face. Someone approaches and helps him to grasp his time-traveling device, which then transports him to a hospital in the future. While the agent is recovering from facial reconstruction, it is revealed that he has been trying to prevent the attack of the so-called "Fizzle Bomber" in New York in 1975. After his recovery, he receives his last assignment.

The agent moves to 1970 New York. As a bartender, he starts a conversation with one of the customers. The customer, John, writes true confession articles under the pen name "The Unmarried Mother." This pseudonym is explained by his own life story, which he tells the bartender. Born female, the customer grew up as "Jane" in an orphanage. She excelled in her studies but had difficulty fitting in. Jane decided any children she had would be raised in a proper family, and thus avoided relationships. As an adult, she applied for a program called "Space Corp," which promised women the chance to go to space while providing astronauts with intimate R&R, but she was later disqualified because of a medical condition which had never before been revealed to her, but which greatly interested a man named Robertson. Jane later bumped into a man who said he was waiting for someone. The two eventually fell in love with each other, but one day, the man disappeared. In time, Robertson approached Jane, revealing that Space Corp was really a part of the Temporal Agency, and this agency now wanted to recruit her. They broke off contact when it was discovered that Jane was pregnant with her ex-lover's baby. While performing a Caesarean section, doctors discovered Jane was intersex, with internalized male organs, as well as female organs. Complications during birth forced them to remove her female organs, and as a result, she had to undergo gender reassignment and begin living as a man. Furthermore, the baby was stolen by a mysterious man. Ever since, John has been living a bitter life, writing fiction as "The Unmarried Mother."

The agent offers to take John back in time to the day that Jane met the man who would later become her lover and leave her, so John can take revenge and kill the man for ruining his (Jane's) life. In return, John will take over the agent's job for whatever duration he wishes. The agent reveals his time-travel device, and the two jump to that day in 1963. John intends to kill his past lover prior to the moment when the lover first meets Jane. While waiting, John encounters Jane, and as they begin talking, John realizes that he is the man who later becomes Jane's lover. The baby born from this "SELF-FERTILIZATION" is stolen by the agent, who uses the time machine to take the baby to the orphanage, 18 years earlier in 1945. Therefore, Jane, John, and their baby are the same person, revealing a predestination paradox.

The agent goes to 1975 New York, where he helps the burned man from the beginning of the film. The agent returns to 1963, a few months after he dropped John off. He convinces John that John must leave Jane behind, and he uses the machine to take them both to the Temporal Agency. John now takes over the agent's job, so the agent can retire in 1975 New York, close to the day of the Fizzle Bomber's attack. Upon arrival, the agent's time-travel device does not decommission itself as planned and can still be used. He has been ordered to check a launderette at the moment the Fizzle Bomber will be there. The Fizzle Bomber turns out to be the agent's own future self, now suffering from psychosis as a result of excessive time travel. The Fizzle Bomber insists that his actions have saved and will save more lives than the lives lost and that they ultimately lead to the reinforcement of the Temporal Agency. He tries to convince the agent that the only way to end the cycle is for the agent to spare the bomber's life, unlike the Fizzle Bomber did in his past as the agent. The agent denies he will ever become the Fizzle Bomber and kills his future self.

The film finally reveals that in 1975, John is the man who traveled to New York and was burned while disarming a bomb. His subsequent facial reconstruction significantly changes his appearance, and it is now clear that Jane, John, the agent, and the Fizzle Bomber are the same person. This agent's creation was orchestrated by Robertson to create an agent who has no ties to time. This "perfect" temporal agent was responsible for both his own conception and death. This was really a tricky one and has driven the predestination paradox to its limit.

Paradoxes or to say specifically "TIME PARADOX" or we can say "THE TEMPORAL PARADOX" can be of either of the three types; one being the casual loop (illustrated earlier as Predestination paradox), the other as the Grandfather Paradox and the third one as Fermi paradox. Now the first two are already clear to us by now.

The third paradox or Fermi paradox talks about the two possibilities that if time travel were possible (i.e., if we could go the past) and other where people could visit us from the future. Answers vary, from time travel not being possible, to the possibility that visitors from the future can not reach any possible point in the past, or that they disguise themselves to avoid detections from their own selves. This paradox is rather a statement and not so common theory about one not meeting or coming across his/her own self in the past or future and if that happens then there comes the paradox. According to this theory, the timeline gets altered due to one meeting his/her own self which in turn will either guide or misguide the present timeline either to be in his favor or against.

Now, what if we could change our choices, what if we could know the future for all the choices and from there pull out just the one correct choice which can alter the temporal dimensions. If you couldn't understand it then let's take an example. Suppose, you meet your best friend in the school. You met him/her when you saw that person helping in an accident. Now, what if we say that we could alter the accident and save the person (who met with the accident) just before the accident really happened. So this will result in a total parallel timeline where the accident had never taken place and now you don't even know that your best friend even exists in this world. Pulling out the results from this alteration, we can say that a person's choice and the person's alteration of that choice to another can bring about a distinct change in both their lives and whatever decisions that you took for/with/against your that friend will cause a temporal brain to vanish where neither of you both could remember what had happened in the different timeline. This temporal brain-vanish can also result in some side effects to the brain where he/she could have dreams or daydreams about the one possible outcome of their choice they took in the past in a different timeline. The past and the present always remains constant. But talking about the future, it changes. It changes on each and every step you take in the present which configures your future to be good or bad in any respect.

Now when we talk something about the space and dimensions, the only thing that can come into our minds would be the outer space and the planets and the stars, the nebula, the galaxies, the universe and some other forms of bodies. But this is only one of the assumptions that we take that we believe in. We can't just say that this is the only extent of outer space. Outer space is everything other than the earth itself. But space is something really wider than we think.

We are surrounded by many things like vehicles or cars or bikes, buildings, people, roads, etc. Each one of us is nothing but a player on this planet who has their own characteristics and capabilities. Space is only not the outer space but also every minute gap that we have between each an every object that we can see. Let's see it differently. What if we erase all the cars. What if we erase all the buildings, the plants, buildings, parks, roads. What if we remove everything. What if we remove the Earth itself. Now, what we see here is the outer space only. Now what we just erase the stars, the solar system, the galaxy, or even the tiniest presence of anything we see here to be erased. What did we get now? - Nothing!!!

We get something right but we can't see it. We get a dark space left Infront of us. This is what we call "SPACE". This is also why we call an empty place to be "EMPTY SPACE". Anything we see that helps us to distinguish between things is the space. Think of a place where there is no space that means everything is stocked together and there is no individuality among anything. This property of space tends to create the Spacetime. This theory can be proved by the very first example we saw about a man going really fast, approaching the speed of light can create time to slow down. Well, now we have an answer to this question - Why?

When we speed up to a certain level that where each and every other people seems to be moving backward and we were on a seat there is an alteration in our space-time and the viewer's space-time. Why does it happen that when we speed up we reach the destination faster than when we are slower?

Now, here comes the theory of space-time showing this example. The answer to the above question stands simple. When we speed up, the space around us gets a tension for the speed in which we are going. Now, to release the tension the time around us gets slower for us and faster for the viewers. So while we travel fast actually faster than the viewers, there is a fraction of the thousandth of the nanosecond change in both the timelines. This means that as the astronauts travel to space there is a slight change in their timelines from us and this is because time is trying to adjust with the speed and instant expanding and contraction of space. This is why it's nearly impossible to reach the speed of light with the present equipments that we possess but maybe in the near dear future, this theory might be proved totally incorrect. Scientists and astronomers are constantly trying to change the perception of mankind in every way possible by their hard work and determination.

Whenever we are in speed, we are actually trying to adapt to the time by making its total use, so the space that contains an element or the dimension of "TIME" in it tries to bend the space around it so that the person taking advantage of time can actually make its use and it seems to the person that he/she has gained speed, where actually its the element of space and time together with the perception of the viewer and the viewing capacity of that particular viewer, that has created an illusion of speed into the minds of the people/us. We can't outrun speed but if we can outrun space then their time can help us compute the speed that can even help in a strange phenomenon "TIME TRAVEL".

Seems a bit confusing and unreal... Right??

Let's have a look at it this way. When we remove everything in Infront of us we see a dark space in Infront of us. That we proved above is the space. Now, if an object moves in that space in any speed there will be nothing to compare it with. The perception will come that they are moving and the mind will constantly say that the body is moving. But wait... With respect to what??

This is why we need space-time and dimensions together in one place to prove all the laws and theories. If space wouldn't exist we would not be able to do anything starting from the point of existence, i.e., we would not be existing in the first place if it was not for space that exists. If ever we could exist and be alive we would not be able to do anything that we are capable of doing today. It's all in the quality of the space-time and dimensions together forming a whole bunch of possibilities and each possibility having a different perspective and time plays along with all these which in turn helps the dimensions to exist which in turn helps us to live. It is not far when the day will come when we could travel in time. But is it actually possible?

Let's keep this topic aside just for a bit.