Let's take our second stand point in this post. Time exists forever as it is part of our world's existence.
Let's start with time comes into existence when there is a start and an end. There can be a start and an end when there is a motion. So, if everything is idle in a world, then there is NO TIME! So, we can say that at the very instant when the first movement occurred in the universe, the Time was born!
We all know about Big Bang theory. Our universe was tiny in size with maximum pressure, huge temperatures and incredibly dense with high energy. Our interest here is where we see Time. Big Bang also states that the highly compressed universe started to expand around 13.9 billion years ago. Approximately 10−37 seconds into the expansion, a phase transition caused a cosmic inflation, during which the Universe grew exponentially.
In my previous post, we saw that Time came into existence when the motion started for the first time. If we consider that the universe was idle before Big Bang, then we are right. Time came into existence the very soon after the Big Bang occurred. I mean to say that the Time, what we are referring now days, came into existence at the 10−37th second after expansion but what if the universe was active even before Big Bang? Think through it...
There is another perspective to understand Time. That's what explained in special theory of relativity by Mr. Albert Einstein. He explained a concept called Time dilation. Let's take a look at it.
When a second-hand ticks in a clock, we call the time interval as 'a second'. Let's consider that you are sitting in a jet which moves away from the clock at the highest possible speed, say speed of light. As you move further away, you see the second-hand now takes more than a second to tick. That's because the light takes more time to reach you! If it doesn't make sense let's consider a simple scenario to understand this much better.
You are watching a movie, played from a DVD player. As the player plays the video, it also indicates the time elapsed and the time left in it's LCD display. Now, the movie suddenly stops! You would also not miss to notice or realize that the elapsed time is also stopped at a specific point. I know this example might sound too simple to understand Einstein's concept but trust me that's what happens when you see that things around you stop moving!
Yes, now you got it where I am going to. The Light is the primary cause for the Time to exist in this universe. That's why when the speed of your frame of reference changes, there is a change in Time. You can have a question that, there are fastest trains in the world and will the travelers refer different time than others who are in resting frame? No, because Time is relative to one's frame of reference.
The individuals always see their watches showing the same time but the difference gets the visibility after the travel when they both meet each other in a same frame of reference. The amount of difference is proportional to the speed or I would say, as it approaches the speed of light. Finally, does it have anything to say about Time's origination? Yes. Time is a byproduct of Light. If there is no Light in this universe, there is no Time. Let me clarify 'Light' here. We are not talking about electricity. This is the electromagnetic waves which has been giving Life to our universe for the last 14 billion years!
Hence, irrespective of whether the universe was active or idle before Big Bang, the Time, what we are referring, came into existence when the Light came into existence and that means at the 10−37th second after Big Bang!
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