WHAT IS THE TIME?CAN TIME TRAVEL POSSIBLE THROUGH TIME? YOU HAD NEVER HEARD BEFORE.!!

BY NAMAN SUBEDI,
Introduction;
Before going to the topic i.e 'Secret Behind The Time.' I would like to discuss about the time. The word 'Time' is itself in a contradiction. Physicists are also not clearly understanding about time. Time is the reading of any synchronized clock while any event is happening. Let me make you clear with an example, if you are waiting for the bus at the bus station and after sometime bus arrives and if you take the reading of clock at the mean time of arrival of the bus then that is the time at that moment. So, In terms of Physics, Time is the reading of the clock of any event. The topic' Secret Behind The time' means the strange behavior shown by the time. Since the topic 'Time' is itself in a contradiction, so I have put the title of this research paper 'Secret Behind The Time'.

Secret Behind The Time;
We often use the word 'Time' in our daily life but we are also unknown about the meaning of time, actually. So I have told that it is in a contradiction due to which I have used the word 'Secret' in the topic. Time always flows or passes. It doesn't stops. Time never flows in a constant speed. It varies according to the place and situation. So, Einstein also told that time is an illusion as it is not fixed. Time for any place may vary if the situation varies. Time is inextricably linked with space and matter. Time itself can't exist in the absence of matter and space. So, if the matter and space have beginning and an end then time also must have beginning and an end.
Time shows very unique behavior. When the object moves at a very high speed then the time would slow down for that object. An object will find itself in future if it stops and comes out in the real world. Let me make you clear with an example, imagine the two persons whose name are Sailesh and Bishow. Then if Sailesh is travelling in a aero plane in a very high speed and Bishow is observing from the earth. Then, time for Sailesh will be slower than the time of Bishow. However, Sailesh will feel that time is passing normally for him but infact time is passing slowly for Sailesh and when he comes into the outer world he will find himself in future. This happens due to the effect of time dilation which is the actual difference of elapsed time between two events as measured by observer differently at any place or situation.
Another very interesting thing that I have found is here, Time suddenly stops for any object which is moving at the speed of light. That means there is no time for the light. Here, one question might have arise here in your mind that, if time suddenly stops for the light or time wouldn't flow for the light, then why it takes 8 minutes and 20 seconds for light to reach the Earth from the Sun?
Ans; It is that, we are observing the time for the light which is coming from the Sun here from the Earth. We don't keep any clock or watch in the light. However, if we keep it, then time wouldn't flow or stop to flow in clock or watch. It is calculated in this way,
The Earth revolves around the Sun from the distance of 150 million km and that the speed of light is 300,000 km/sec. The time that we calculate for the light to reach Earth from the Sun is;

            time(t)=distance of  Earth from the Sun(d)/speed of light(c)

=150000000/300000
=500sec
=8 mins and 20 secs
which is the time taken by light to reach Earth from the Sun.
Time is also affected by gravity or gravitation. The lower the gravitational potential (closer the clock is to the source of gravitation), the more slowly time passes. Suppose we have two clocks, one is placed closer to the surface of the Earth while the other is high in space. The clock which is closer to the surface of the Earth will run slower than the clock placed up high in the space. Well at first though, this seems pretty absurd and it is hard to think of a reason for such an awkward behavior. I will give an interesting example, suppose you are in the space sitting in the space shuttle, then after while you return to the Earth, you will find your age more than your age actually have to be. This happens because you were in the lower gravitational potential and the time would run faster in space then at the Earth.

                               The reason for this is here, the clock that physicists used to understand this concept is "light clock". In this clock when light ray strike to the surface then clock ticks. As light have momentum and momentum is affected by gravity, so light is also affected. Infact, light would follow curved trajectory or curved path under high gravitational potential which causes clock tick slower. In lower gravitational potential, light is not or less affected by gravity it strikes the surface faster of light clock. This is the reason that your age will be more in lower gravitational potential than in higher gravitational potential. So, stay in the area where there is higher gravity so that your death will come slowly.  
                   Another very interesting thing is here, the stars which we see are of past time. These stars aren't of this time. As, time runs slowly on the Earth we are observing the stars being at the past then those stars. This is also another reason that if Sun is destroyed then we will be noticed only after 8 minutes and 20 seconds that the Sun is destroyed. If any aliens tries to observe our Earth from far galaxy then these aliens might see the dinosaurs walking on Earth. They mightn't see the present time of ours because time differs in their planet and in our planet. Due to all these reasons, in physics Time is an illusion.
                  Time always runs. We often use the word 'NOW' in our daily life but how that 'NOW' changes or moves to the future, we don't notice. The reason that 'NOW' always moves to the future is, the universe always changes and changes is the engine which causes to move 'NOW' into future and time also always moves as the changes always occur in universe.

Conclusion;

    So, I showed how time changes according to place and situation. That's why, Time isn't absolute in Physics, it is an illusiin.