Is Time Travel Possible? Stephen Hawking's Perspective

 "Possibility Of Time Travel  And It's Paradoxes"

Human are dreaming of time travel since great scientist Albert Einstein had generated the theory of relativity, people have been searching of possibility for time travel in this theory. There are many stories on this matter, film makers released many films. Yet time travel is still dream which is not came in true, And practical. Although Einstein's theory of relativity shows possibility about time travel but there are some paradox too. One of the great scientist, physicist Stephen Hawking, who gave whole life for exploring the universe. He thought differently on time travel, his scientific and cosmological ideas makes more possibility of time travel. 

I want to reveal the mysteries of the universe to you. Like, is time travel possible? Can we find a shortcut to go to the past or the future? Can we use the laws of nature to control time? Many scientists consider time travel to be deception or deception. I am not as alert as I used to be, and I don't care about those considerations.

Actually, I am like those people who made the scientific era. If I had a time machine, I would have been looking at Merlin, Mundro and Galileo, because they have changed their view of the universe from their binoculars. And maybe by traveling to the end of the universe, we would have found out that our entire universe is going to end.

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But how is this possible? To understand this, we will have to look at time from the perspective of physics. It is not so difficult to look at the fourth dimension from this perspective. Every astrophysicist knows that you, me, even my chair, all these physical things are present in three dimensions.

Everything is based on length, width and height. But there is another kind of length, which is the length of time. For example, a human being lives for 80 to 100 years, but the stones of the ancient age have been standing for thousands of years, and our solar system has been present for billions of years.

That is, everything is present in space with the length of time. The meaning of time travel is to travel through this fourth dimension. To see and understand what it means, let's think that we are traveling in a car like an ordinary day.

If we drive a car in a straight line, we are traveling in the same dimension. If we turn right or left, we are joining the other dimension. And if we drive a car up and down a mountain road, we are joining the height or depth, i.e. the third dimension.

This means that we can easily travel in all three dimensions. But how can we time travel on earth? Can we make a way through the fourth dimension? Let's watch a science fiction movie for a while. In time travel movies, there is often a huge machine that gives energy.

That machine makes a way in the fourth dimension, which we can also call the tunnel to go into time. And a time traveler is a brave man who is also a little stupid. That's why he goes into that tunnel, without knowing when he is going to reach.

This opinion may seem like a far-fetched idea, and maybe the reality is different from this, but the truth is that it is not impossible to do. This thought itself is not as crazy as it is understood. The scientists were also thinking of making a tunnel in time, but we are thinking about it from a completely different perspective.

We are thinking that can we make a way on the basis of the laws of nature to go into our past or future? And when we searched, we found that it was already there. And not only that, we have also given it a name, which is called wormhole. The truth is that there are wormholes all around us, but they are so small that we cannot see them.

Wormholes are very small, they are on the edges of space and time. You may find this strange, but let me explain to you. If you look carefully, you will see cracks, holes, or cracks in everything.

This is a common principle of physics, which applies to time as well. Now you take this pool table, its surface looks completely flat, but if you look carefully, you will realize the truth. There are countless holes and cracks in it.

Even in a smooth thing, there are many small holes, cracks and holes. In the first three dimensions, I showed you all this very easily. But believe me, this applies to the fourth dimension as well.

There are small holes, cracks or holes in time as well. If we talk on a very small scale, I mean on a smaller scale than atoms and atoms, then we will get what is called quantum form. This is the place where the wormholes are.

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These small paths between time and space continue to form and close. They are always present in this quantum world. In fact, they connect two different places and two different times.

But the sad thing is that these real tunnels are only as small as one billionth of a centimeter. Obviously, no human can pass through it. But these wormhole time machines can be the basis for us.

Some scientists believe that many of these tunnels should be made so big that no human or space ship can pass through them. If we have such technology and we get the energy we need, then maybe we can make a huge wormhole in space. I'm not saying it will be made, but it can be made.

And if it is made, it will prove to be a very powerful machine for us. One end of it will be close to the earth and the other on a very distant planet. It can be even better in a conjectural form.

If we keep both its ends in the same place and the distance between them is of time instead of space, then our ship will come and go close to the earth, but its journey will be in our past. It is possible that our ship will reach in front of the dinosaurs, right in front of them. Now I also feel that it is very difficult to think in all four dimensions.

And the wormhole is not such an easy thing that we can dig our heads in it. But don't lose hope. I have thought of an experiment that will find out if we can time travel through a wormhole today or in the near future.

I like small experiments and drinking champagne. I tried to see if time travel is possible by combining these two favorite things. I am giving a party to welcome those who are going to the city of the future.

But there is a page in the matter that I will tell them about it only after the party is over. This is the invitation in which everything about time and space is written. I hope that one copy of it will remain in some form for thousands of years.

It is possible that through some means, this will be found by some creature of the future and it will try to come to my party through the wormhole time machine. This will prove that one day time travel will be possible. And now those time travel guests will come here.

5 4 3 2 1 No one came. I was thinking that the Miss Universe of the future will come to me. But why was my experiment unsuccessful? Maybe there is a reason for this and that reason has been associated with the time travel of the past for a long time.

That is the problem of opposition. Laughter comes only by thinking about opposition. The biggest of these is what we call the Grandfather Paradox.

I am going to show you a new form of it, which I call the opposition of the psychic-scientist. I do not like the scientists shown in movies because they are often shown as psychic or mad. But he is actually a psychic, he wants to make an opposition and is ready to give his life for it.

Just think that someone has made a wormhole in the time tunnel and he can only go back for a minute. Although a minute does not take much time, but a minute's time travel can also be a big problem. The scientist can see from that wormhole how he was a minute ago.

But what if he kills the form a minute ago? He is dead. He could not even attach the pistol that he was killed. But who fired the bullet? This is the opposition.

It has no meaning. Because of this, we live in a space-scientific dilemma. In this way, the fundamental rule will break, because of which the whole universe is running.

With this, we can see the result of some work, but we cannot change it. I don't think anything can make itself impossible. And if it could do that, then no one can stop the whole universe from going into chaos.

So, there is something that stops the opposition. There must be some reason for this that our scientists never get to the point where they shoot themselves. I apologize, but the root of the problem in this matter was the wormhole.

I have come to the conclusion that there can be no existence of such a wormhole. The reason for this is feedback. If you have been to a music festival, then you must recognize this sound.

This is the feedback. The reason is also very ordinary. The sound goes into the microphone.

It goes ahead through the wires and comes out through the speakers faster than the amplifier. But if the sound coming out of these speakers goes back into the microphone again and again, it will form a loop and the sound will get faster and faster. If it is not stopped, then the feedback will destroy the entire sound system.

I think this happens with the wormhole too, but it has radiation instead of sound. As the wormhole grows, natural radiation enters it. And it forms a loop.

And its feedback is so powerful that it destroys the entire wormhole. That is why I can say that there are still small wormholes. And maybe we will make it bigger tomorrow.

But they will not be able to be used like a time machine. This is the reason why no one came to my party. I feel that it is impossible to travel back in time in any way.

If we do this, there will definitely be opposition. Unfortunately, we may never be able to travel back in time. This will be very sad for the dinosaur hunters and the historians will be very happy.

But this is not the end of the story. It is not that we will never be able to travel back in time. There will be a time travel, but not in the past.

There will be a time travel of the future. Time moves forward like a stream of a river. And it seems that we are flowing with time.

But time is like a river in another way. It flows at different speeds at different places. And this is the capital of the journey of the future.

Sir Albert Einstein had given this thought more than 100 years ago. He had an idea that at some places the speed of time becomes very slow. And at some places very fast.

And he was absolutely right. The proof of this is right above us. In space.

This is the Global Positioning System i.e. GPS. The network of many planets that revolve around the earth. The planets show the way to the planets.

But they also know that the speed of time in space is faster than that of the earth. There is a very accurate clock in every spacecraft. Even after being so accurate, it becomes as fast as 1 second per billionth of a second every day.

It does not grow much, so it has to be fixed every day. If this is not done, then due to this very small change, the whole system will be spoiled. This will make a difference of 10 kilometers per day in every machine on earth.

And you can guess how much difference it can make, how much chaos it can be. But the problem is not in those clocks. Here, time runs faster than the earth below.

The real reason for this huge difference is the weight of our earth. Einstein had an idea that the effect of a pendulum falls on time. And like the slow flow of the river, it slows down the speed of time.

The heavier the pendulum, the more it pulls on time. And this is the unique truth with which we can travel the time of the future. I believe that it is not so easy to understand this.

So let me give you an easy example. This is the famous pyramid of Giza. It weighs more than 4 crore tons.

Like every heavy pendulum, it is also slowing down the speed of time. Here, this effect is very low, less than one billionth of the earth. But if we increase it a lot, you will understand the point.

It will seem that the same thing is happening here. Just as the flow of the river decreases in many places. Here, time runs a little slower than in other places.

This is the effect of the weight of the pyramid. This change opens the ways of time travel for us. If we want to travel time, then we need something that is much heavier than the pyramid.

And I know what that thing is. There are about 26,000 light years away from us in the center of our galaxy. The heaviest thing in our entire star system.

And it is covered with clouds of gas and stars. It is a very big black hole. Its weight is greater than 4 million suns.

And it seems that he has been suppressed inside it under the pressure of his own gravity. The closer we get to that black hole, the stronger the gravitational force will be. If you get too close to it, even the light cannot escape its grasp.

It is a ball of gas about 250 million kilometers in the dark. Such a black hole has a very deep effect on time. It reduces it so much that no other part of the universe can reduce it that much.

And with this, it becomes a natural time machine. I am thinking that what will happen if one day a spacecraft succeeds in taking advantage of it. First of all, that spacecraft will have to avoid being pulled inside.

For this, they will have to pass through its edge so that they do not pull it. They will have to keep the right direction and speed, otherwise they will not be able to escape. If everything is going well, then that spacecraft will start orbiting about 5 million kilometers around it.

There it will be completely safe. Its speed will be such that it will not be able to fall any further. If a space agency is controlling that spacecraft from far away from the earth or that black hole, then it will feel that its spacecraft is orbiting in 16 minutes.

But the brave people sitting in the spacecraft will be very close to that huge bridge. And for them, the speed of time will be very low. There its effect will also be different from being near the pyramid or the earth.

And for the crew of the spacecraft, the time will be almost half. For their 16-minute orbit, they will feel only 8 minutes. They will keep orbiting it and will feel only half the time from the people sitting far away from that black hole.

The spacecraft and its crew must be traveling through time. Assume that the crew in that spacecraft traveled around that black hole for 5 years. Then the world would have moved 10 years ahead.

And when they come back to earth, the age of the rest of the people will be 5 years older than them. The crew of the spacecraft will return to the earth of the future. It must have not only traveled through space, but also traveled through time.

It means that a very large black hole is no less than a time machine. But it is obvious that it is not a spacecraft. Yes, it is definitely a little different from the wormhole.

Because it does not have anti-gravity. It also does not destroy itself with feedback. But it is very dangerous.

It is very far from us and it will not take us very far in the future. It is fortunate that we have another means of time travel. With its help, we can also make a real time machine.

Because it is our last but best hope. What we will talk about now is not easy at all. But yes, there is a very simple way to do this.

For this, we will have to travel very fast. Much faster than the trajectory of a large black hole. The reason for this is also a unique fact of the universe.

The speed limit of the universe is 2,09,792 km per second. We call it the speed of light. Nothing can go faster than that speed.

You may find it strange. But believe me, this is one of the most important principles of science. Whether you believe it or not.

But we can also travel at the speed of light and the speed of light. We can share the future. How will this happen? To understand this, we imagine a vehicle service of science fiction films.

Suppose there is a track all around our earth. A super fast train runs on the track. We will take that imaginary train as close to the speed of light as possible.

We will see how it can become a time machine. It is ridden by sailors going on a one-way journey to the future. The speed of the train is getting faster and faster.

Soon it begins to orbit the earth. But to reach the speed of light, it will have to travel around the earth very fast. Seven times in one second.

But why don't we try a million times? The train will never be able to run at the speed of light. Because the laws of physics will stop it. Yes, it is so sure that it can reach around the speed of light.

But then there will be an extraordinary thing. In that train, time will run much slower than outside. Just like it runs around the black hole.

But even slower than that. This is to save the speed limit. And you can also understand the reason for it.

Imagine that a child is running in the direction of the train. If we add the speed of his running to the speed of the train, his speed will increase, right? So even if he does it by mistake, won't the speed limit be crossed? But no, he won't be able to do that. The law of nature will not let him do this by reducing the speed of time in the train.

It can't run so fast that it crosses the speed limit. Time always reduces its speed to save the speed limit. Based on this fact, we will be able to determine a longer distance in the future.

Imagine that this train runs from a station on January 2, 2050. It continues to travel around the earth for the next 100 years. Then it stops on January 1, 2150.

But only a week's time has passed for the passengers sitting in it. Because the speed of time in the train had become so slow. When they come out of the train, they don't see the world they left behind.

They have traveled 100 years in the future in just a week. It is impossible to make a train that runs at that speed. But we have made something like that train in Geneva, Switzerland. A particle accelerator, which is the largest in the world. There is a round tunnel in the depth of the earth. Which is about 26 km long.

In which small particles are formed. As soon as it is run, its speed reaches 1 crore km per hour in less than a blink of an eye. If the power is increased, its speed will also increase.

Then a time will come when it will start spinning 11 times per second. That is, at a speed close to the speed of light. But like a train, it will not be able to reach the speed of light to the limit.

It will only be able to reach 99.99% of that speed. But if this happens, it will also start traveling in time. The reason for this is that it is a particle accelerator whose age is very low. Usually, they break in the 25th billionth part of a second. But if they are run at a speed close to the speed of light, their age increases by 30%. This particle is a real time traveler.

This is just so ordinary. If we want to travel in the future, then we have to go as fast as possible. Very fast. And I think we have to go into space to do this. For the time travel of the future, we need a very fast speed. For this, we will have to make such a spacecraft that is a very big machine.

That spaceship should be so big that it can hold so much fuel that it can run at the speed of light. To reach the speed of light to the limit, it will have to run at full power for 6 years. In the beginning, it will have to take it slowly.

Because the spaceship will be quite big and heavy. But later its speed will increase and it will start going for a long distance. In just a week, it will reach a planet like Neptune, a giant ball of gas.

After 2 years of continuous movement, it will reach half the speed of light. And it will reach quite far from our solar system. After the next 2 years, it will reach 90% of that speed.

Then it will cross our closest star system, Alpha Centauri. After traveling about 50 kilometers from Earth, and after 4 years of its launch, every hour on that spaceship will be equal to 2 hours on Earth. Its condition will also be like the spaceship that travels around that huge black hole. And the story does not end here. 

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