There is always a big misconception of Einstein's relativity theory. People think there can be a machine which can take us in the past or future.
Here I am trying to clear these misconceptions a bit.
As we all know, light has a speed. Light rays travels 3Lakhs KM/second. So from earth if we observe the universe, we are not watching the universe which is in current state. Whatever events happening in the universe happened long back but we are seeing now because light rays took time to reach earth from the point of happening.
Now imagine we have another small earth which is ahead a light year from earth and we have a phone connection from there to here.
Now the the event what I am observing here today is seen there one year before. So if some one from that place call me and tell about an even which I am going to see after a year then I could think they are in future. But in reality they are relatively ahead of me from the event point.
So an incident happened is happened, we can not change in any case. It is just that when we can see the event happening varies from place to place depending on your relative position.
Same applies to going in past. Now think another planet which is a light year behind our earth. Lets assume they have a camera which can focus any point on earth.
Now lets think a murder committed in new york city and we don't have much clue about the murder. Lets think we need to go in past and focus our satellite to murder point and observe what is happening. This is not possible from earth. But light rays emitting from murder point started traveling in universe. We can call a planet which is a light year behind and focus their camera at murder point. As another planet is exactly 1 light year behind earth, their camera can see the murder event happening after exactly one year from earth. This is nothing but going in past.
To conclude this article, it is only relative position that decides when you can an event happening. There is nothing like going in past or future and you change the course of event unlike we see in sci-fie movies :-).
Here I am trying to clear these misconceptions a bit.
As we all know, light has a speed. Light rays travels 3Lakhs KM/second. So from earth if we observe the universe, we are not watching the universe which is in current state. Whatever events happening in the universe happened long back but we are seeing now because light rays took time to reach earth from the point of happening.
Now imagine we have another small earth which is ahead a light year from earth and we have a phone connection from there to here.
Now the the event what I am observing here today is seen there one year before. So if some one from that place call me and tell about an even which I am going to see after a year then I could think they are in future. But in reality they are relatively ahead of me from the event point.
So an incident happened is happened, we can not change in any case. It is just that when we can see the event happening varies from place to place depending on your relative position.
Same applies to going in past. Now think another planet which is a light year behind our earth. Lets assume they have a camera which can focus any point on earth.
Now lets think a murder committed in new york city and we don't have much clue about the murder. Lets think we need to go in past and focus our satellite to murder point and observe what is happening. This is not possible from earth. But light rays emitting from murder point started traveling in universe. We can call a planet which is a light year behind and focus their camera at murder point. As another planet is exactly 1 light year behind earth, their camera can see the murder event happening after exactly one year from earth. This is nothing but going in past.
To conclude this article, it is only relative position that decides when you can an event happening. There is nothing like going in past or future and you change the course of event unlike we see in sci-fie movies :-).
Superbly explained..!
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