Thoughts on Episode 3 - "Is Time Travel Possible" of Season 1 of "Through the Wormhole" by Morgan Freeman.
If there be a time travel machine through which we did travel in past, would we be able to grab things or to say make any changes to them?
In my view, traveling in past is not the same thing as being part of it. Whenever we see in far distances in universe we actually are traveling in past. When we see Andromeda Galaxy, nearest spiral galaxy to Milky way, 2.5 million light years away from Earth, we are actually looking Andromeda as it was 2.5 million years in past.
To explain this, lets consider this case - It takes light 8 min from Sun to get to our eyes on Earth. That means every time we see Sun, its 8 min in past. And if Sun disappears now, we will realize that 8 min later. Lets say, we design a robotic arm that can extend from earth all the way to Sun in just 1 min and tries to grab it. If at this very moment the Sun disappears, but because of time it takes for light to travel the distance, we will still see the Sun. Now if we try to grab the sun at this very moment, when our fictional robotic hand would reach near the Sun, we wont feel like it grabbed onto anything. But when we look towards the Sun, we will still be able to see it. Not just for moment, but for whole 8 min we would see the Sun, but wont be able to grab onto anything.
I think, even if we did travel in past, it would be like being in a Virtual Reality simulation, a perfect Virtual Reality, where you cannot infer artificial as not being real, but when you would try to grab something, you wont be able to get a hold of it.
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