Understanding how time travel is possible requires thinking like a physicist. Yes, I am talking about the fourth dimension. It may seem a bit difficult but it is not. Even a small child knows that every object is located in three-dimensional space. This is me too. Everything has length, width and height.

Travel to the fourth dimension

But one problem with time travel is some paradoxes. The most famous of these is the Grandfather Paradox. Let's put it a little simpler. I named it Mad Scientist Paradox. Suppose I make a time-tunnel, which is only one minute long. Staring at it, the mad scientist is seeing what he looked like a minute ago. But what if he shoots the face of the other side of the tunnel? Did he die a minute ago? So who did the shooting?

Such a time machine goes against a fundamental principle of the universe. Cause occurs before effect. Never the other way around. Otherwise the universe would be chaotic. As a result, I believe, somehow the scientist will fail to shoot himself. Without that, wormholes don't seem to be able to survive for long. Suppose a speaker is playing music. The sound was increased by adding a microphone to it.

What if the speaker is placed in front of the mic? The sound will get louder with each turn. If no one stops it, the whole sound system will eventually collapse. The same happens with wormholes. But here radiation will work instead of words. As soon as the mouth of the wormhole opens, radiation will enter it and spin in a loop. At some point its power will increase to such an extent that it will be destroyed. That is, tiny time-tunnels will not work in reality.

But there is another way to go into the future by time travel. Time flows like a river. continued But the speed of flow is different at different places. Einstein first said it 100 years ago. The evidence is right at our fingertips. We currently use Hardam GPS.

It works through satellite. Satellites have very accurate clocks. But not 100%. The satellite's clock runs one hundredth of a billionth of a second faster than Earth's clock. If this is not taken into account, the GPS directions will be incorrect. Those clocks run faster because time moves faster in space than on Earth. This is because of the mass of the earth. The heavier an object is, the more it slows down time. This opens up another possibility of time travel.

At the center of our Milky Way galaxy are the heaviest objects in the galaxy. There is a supermassive black hole. The mass is equal to forty million suns, that mass concentrated in a single point. Not even light can come out from very close to it. Black holes distort time the most. Creates a natural time machine.

Imagine someone squeezes into a spaceship and travels to a black hole. As seen from Earth, it orbits the black hole once every 16 minutes. But instead of every 16 minutes the astronaut is experiencing only 8 minutes. As a result, he would feel half the time than someone far away from the black hole. The astronauts of the vehicle will continue to travel through time. Suppose he wandered like this for five years. Come back and see that 10 years have passed in the world. I mean, more than five years.

That means supermassive black holes are a time machine. It also doesn't give rise to paradoxes like wormholes. But the idea is not entirely realistic. And very scary. You can't go too far into the future like this. But the good news is that there is another way. It has to go much faster. As we know, there is a fixed maximum speed limit in the universe. This is 186,000 miles per second, which is another name for the speed of light. Nothing can be faster than that. Believe it or not, if you run at speeds close to this speed you will be gone in the future.

Imagine a railroad is built around the world. A fast train started moving over it. Velocity is very close to the speed of light. The train will go round the world one by one. About seven times per second. Now strange things will start happening inside the train. Time will flow slowly compared to the outside world. As happened near black holes. However, it is not possible to increase the speed of the train above the speed of light. If someone starts running inside the train, isn't the combined velocity somehow greater than the speed of light? no Because according to the laws of nature, time will slow down to a speed below the speed of light.

Suppose the train left on January 1, 2050. The journey ended 100 years later, on the same date in 2150. But only one week will pass for the passengers inside. Their time was moving so slowly that 100 years had passed in the outer world in one week. That means, they have come to the future world. Yes, it is almost impossible to build such a train. But the European Research Organization CERN (CERN) has such things.

It houses the world's largest particle accelerator. The location is deep underground in the city of Geneva, Switzerland. There is a circular tunnel 16 miles long. Trillions of trillions of tiny particles run through this tunnel. Their velocity increases from zero to 60,000 miles per hour in a fraction of a second. Adding more energy increases this speed so much that the particles circle the tunnel 11,000 times per second, which is very close to the speed of light.

In this way, they can reach the speed of 99.99% of light. At this time, they don't just move from place to place. Even through time. How do we know that? There is a type of particle called the pi-meson. As such, they are broken in a fraction of a second. But at speeds close to light, they take 30 times longer to break.

This is the time travel of the past particles. How do we humans do that? I think there is no other way but to go to space. Apollo 10 is the fastest manned vehicle. The speed was 25 thousand miles per hour. But time travel needs to run more than 2 thousand times faster. It will take six years to approach the speed of light. Within a week it will pass the outer planets.

After two years the solar system will be crossed. After another two years the speed will be 90% of light. 30 lakh crores away from earth. Time travel will also start at this time. One hour goes by in two hours on earth. As was the case with black hole-bound vehicles. It takes another 2 years to reach 99% of the speed of light. In this condition, a year will be completed on earth in one day. This time really went to the future.