TIME TRAVEL

THE TIME TRAVEL

You all heard the word "TIME TRAVEL" mostly in Science fiction movies Time Travel is not only a Science-Fiction. It relates to the Einstein's Theory of Relativity. In the Time Travel You will go to Future or Past? Is Time Travel possible? Let's see about it. 

EINSTEIN's SPECIAL THEORY OF RELATIVITY:

At first we'll see about Twin's Thought Experiment. Let's start with Einstein's Special Theory of Relativity. It has two assumptions. The first one is, The laws of Physics are the same in all Inertial Frame of Reference. Example, You take a Car. The speed of Car is 60Km/Hr. It moves in a constant speed. So, It is in the Inertial Frame. It must constantly move in 60Km/Hr. The car must not accelerate. It is also in the Inertial Frame of Reference. The second assumption is, The Speed of Light in vacuum is constant in all Inertial Frame of Reference. Two mirrors are fixed parallel to each other. If you pass light to one of the mirrors it reflects to the second mirror and the process continued. So, the Light reflects in a same path. If the mirror is in constant motion, The distance travelled by Light also increases. In the above, We see that The Speed of Light is constant.

We all know that SPEED=DISTANCE/TIME. We take the Speed as the Speed of Light. If the distance increases, The light can't maintain its constant Speed. So, The Light delays the Time. Hence, It becomes Constant. You take a person. If the person is travelling in the Speed of Light, The distance increases between You and that person. To maintain the constant value, Light decrease the Time, The age of the person is slowed down. If the person meets you, The person is younger than you. This is not a Theory or Assumption. It is proved by the experiment. 

In 1971, A physicist and an Astronomer placed the Cesium Atomic Lab in US Naval Observatory. That atomic Cesium is so accurate. There is no time dilation in that clock. They took 4 Atomic clocks and made them around the world with two Jets. Comparing the Clock on the Jet and in ground, The clock in Jets around of sink with the clocks in the ground. The clocks are slowed down. Let's see the Twin's Thought Experiment. 

TWIN's THOUGHT EXPERIMENT:

In this Experiment, a pair of Twins are taken. One of the Twin's in Earth travels very fast to Space. The age of them are same before one of them travel. After he returned, The person who travels to Space is younger than the person stays on Earth. How the difference is formed? It is by the TIME DILATION FORMULA. 

If you evaluate this, You can find the exact dilation values. Si, If you travel near the Speed of Light, You age is slowed down. Our body's Biological Clock also slowed down. 

GRAND FATHER PARADOX:  

If you travel in the Speed of Light, Your age, Biological and other Clocks in your Body also stops completely. If you travel more than the Speed of Light, Your time is Reversed or moves Backward. Till now we are seeing to travel in Future. But, We do not see about to travel in Past. You can't travel to Past. To know that you want to learn about the Grand Father Paradox. In this law, You will take three ancestors , A Boy, His Father and his Grand Father. A boy is travelling to the past. Unexpectedly, He Kill his Grand Father. Then, The boy's Birth is not possible. So, It is impossible to travel to Past. Grand Father Paradox is technically called as Law of Casualty. Till now we see the Velocity, If the Velocity increases, The Time is slowed down. Both are Inversely Proportional. Let's see how the Gravity decreases the Time. 

GRAVITY DELAYS TIME?

We will take the GPS Satellite. It rotates Earth in the Lower Orbit. The Gravitational Field experienced by the Satellite is very low when compared to the Object on the surface of Earth. Gravity has an ability to bend the Space-Time Fabric. Space and time are not separate. It was detailed in the Einstein's General Theory of Relativity. Space-Time is a Fabric.

It was bend based on the Mass and the Magnetic Field of the Objects. If the place experience a High amount of Gravity, Then the Time is also delayed. The places with low Gravity, The time will be faster.

THE CONCLUSION:

If the Speed and Gravity increases, Then the Time starts to delay. So, The ageing also decreases.