Time travel is possible! Meet Sergei Krivalev, the man who traveled through time
What if time travel was really possible? Rather, what if we told you that it is not only possible, but also exists? Even more than that, did
? you know that at least one person actually managed to do it
You might think that these are just pipe dreams out of some overly fanciful science fiction movie. But I am happy to tell you, it is very real!
Time travel in physics
When talking about time travel from a scientific point of view, we must first take the viewpoint of the scientific theory concerned with the study of time and space and their relationship to matter, which is Einstein's theory of relativity . This theory tells us that the faster we move in space, the slower we will move in time, and vice versa.
That is, if we have two people, and one of them is moving in relation to the other, time will pass on them more slowly compared to the time that will pass on the other. In addition, relativity also tells us that gravity itself is equivalent to acceleration. The stronger the force of gravity, the greater the equivalent acceleration. And since velocity slows down time, an increase in gravity that equals an increase in acceleration will cause time to slow down even more.
It is these effects of time slowing down that we should take into account when talking about time travel. However, the theory of relativity tells us that we have to travel at very high speeds and very close to the speed of light in the vacuum, in order to start feeling perceptible effects of this kind, or to be near very huge masses, such as being next to a black hole, for example.
And the beautiful thing is, that various experiments have confirmed the validity of the previous two predictions!
Time travel in science fiction
There are a large number of science fiction films and series that dealt with time travel. One of the most famous recently is the movie Interstellar .
In this film, humanity is forced to leave the planet Earth as a result of a major environmental disaster. Since there is no habitable planet that humans can reach with the level of technology found in the movie, humans had to resort to unconventional ways to solve this dilemma. Fortunately, an alien civilization has placed the mouth of a wormhole (a shortcut between two points in space or even two moments in time) near Saturn, where humans can reach, so they can leave Earth.
The journey of the hero of the film was the only part that was scientifically distorted in the film so that they could come up with exciting scenes. On the other side of the wormhole was the galaxy that contained a habitable planet called Miller Planet, but this planet is in orbit around a black hole called Gargandgiola. Because of the massive gravity that the planet is subjected to from the black hole , we find that one year a person spends on it corresponds to seven years on Earth. In this film, the protagonist of the story passes by this hole twice: in the first, his daughter is a child when he leaves and she grows up to be a young theoretical physicist. The second time the father passes by the hole, the daughter grows so much that she is older than him.
And perhaps less well-known than the previous movie, we have the Star Gate series of films and series that dealt in the 16th episode of the second season of the SG-1 series with the topic of time travel in detail, and this episode was titled “A matter of time” in which it happened that a wormhole was opened He reaches Earth with a planet that surprised everyone that it is about to be swallowed up by a black hole.
With the team's inability to close the wormhole, which they opened for several reasons, the effect of time dilation begins to appear clearly and gradually, so that a few hours pass in the lower floors of the base, and close to the mouth of the wormhole, offset by the passage of long days in the upper floors of it. It is indeed one of my favorite episodes in all of this series, which I follow with great interest in all of its films and series.
Sergey Krivalev
But can we as human beings really time travel? In fact, astronauts on the International Space Station, for example, suffer from the two effects we talked about about time dilation: on the one hand, they have time slowing down due to the speed of their movement relative to us, and on the other hand, they are in a gravitational field less than ours (because they are farther from the center of the Earth) makes their time pass faster than ours. However, due to the weak gravitational field of the Earth, what overcomes them among the previous two effects is the slowing of time due to their speed.
And here we come to the story of Sergey Krivalev, he was the longest human being in space, spending 803 days, 9 hours and 39 minutes, which made him travel to his own future by 0.02 seconds!
In the end, we all travel through time according to the theory of relativity, but the effect is so small that it is almost imperceptible. As soon as you leave your friend standing and start walking, your time will slow down according to your friend's point of view. Also, as soon as you move from one point on the ground, to another point that differs from it in height, such as climbing to the second floor of a building, for example, your time will become faster, but in an extremely small and imperceptible manner. This is what prompted me to say at the beginning of the article that at least someone has done time travel, but the truth is, we've all done it, but we simply
! don't notice it because it's just imperceptible
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