How will you feel if I tell you that you can look in the history for real?
I am talking about a scientific theory, not any paranormal activity or any magic or something. Well, this is not actually a time travel but with this method humans can look back in history. With the current technology we can look into the past, in every corner of the earth, every moment in the history no matter how old it is.
Here is how it can be done.
I was watching a documentary recently. In that, NASA had deployed a giant telescope in space which is directed to see the light coming from galaxies which are 1000s of light-year away from earth. What we see through that telescope is not happening in the present but light captured by the telescope is originally emitted before 1000s of light year. The light takes that time to travel till earth. So the images received by the telescope are from the past as you can see in the image below.
Same way, we can deploy our telescope at the other end and we can capture the light coming out of earth. For example, let’s say we want to look back 2 years in history. For this we will put our telescope 2 light year away from earth. The light emitted from earth will take 2 years to reach the telescope. So whatever is captured by telescope is not the current moment but it is the moment from 2 years back. See the illustration below.
This method is a ‘bit’ time consuming and hard but not impossible at all. Just imagine, once implemented, you will be able to see the real video of world war, Tsunami, earthquake, columbus finding USA,, extinction of dinosaurs and other remarkable events.
But there are few problems with this theory
- The first problem we will face is the deployment of the telescope. For the above example, if we want to send the telescope two light years away, it will take minimum of 2 years to send the telescope in its orbit. (Assuming we can accelerate the telescope at nearly the speed of light)
- We will have to transmit the image/video signal from telescope back to the earth. As the wireless signal also travels at speed of light, it will take the same amount of time depending on the location of the telescope. In the above example, the signal will take 2 years to travel from telescope to earth. So the longer you want to look back in past, the longer we have to wait. (Unless we can invent signals that can travel faster than light)
- The first two problems are still manageable. But there is a serious problem with this theory which makes it almost impossible to be practical. Can you figure that out? You don’t have to be a rocket scientist to answer this, just a simple logic will do. Lets hear your answer in comment section for the fundamental problem with this theory