Time and space travel is the dream of many people. We always long for a time and space trip to the future one day. Go back to the past to make up for the mistakes we made when we were young and relive those wonderful times. Go to the future and witness the beautiful life that human future technology brings to people.
Theoretically speaking, going back to the past is likely to produce an inexplicable paradox like the "grandfather paradox". However, scientists proposed a theory called " parallel universe " that can perfectly avoid the "grandfather paradox".
Simply put, if you travel through time and space and go back to the past, it means that your timeline has actually had a fork, and the past you go back to is another timeline, that is, another history. Even if you go back to the past and do a lot of things and change history because of this, such as killing your grandfather, it will not affect your grandfather's existence.
Because your grandfather still exists in other timelines, what you change is not the timeline where your grandfather is. The timeline that is forked is actually a parallel universe.
To put it bluntly, the so-called "change history" only changes the history of parallel universes, not the real universe.
At the beginning, the theory of parallel universes was indeed not a scientific theory, it was more just imagination and guess. However, with the development of quantum mechanics , many strange imaginations in quantum mechanics seem to imply the existence of parallel universes.
What is the biggest difference between quantum mechanics and classical mechanics?
Classical mechanics believes that space-time is continuous and smooth. Quantum mechanics believes that space-time and space are discontinuous at the microscopic level, and there is the smallest unit, which is the concept of quantum .
The core idea of quantum mechanics is uncertainty. I have said a lot before, so I won’t go into details here. To put it bluntly, the state of microscopic particles is uncertain and can be located in two different places at the same time.
And this uncertainty is the premise of the parallel universe theory. The state of microscopic particles is fuzzy, it can be there or here. Only when we observe, the state of microscopic particles will be determined. After
is determined, it does not mean that other states no longer exist. They will still exist and will exist in the parallel universe.
According to the interpretation of the parallel universe theory, there are countless parallel universes, which means that any possibility will happen, and it will definitely happen. When we make any choice, we will separate the parallel universes.
Although we can only make one choice when making a choice, it does not mean that other choices have not happened, they will still appear in the parallel universe. The simplest example is that you choose to go straight at the intersection and give up turning left or turning right, but the left and right actually happened, but they happened in the parallel universe.
So how to go to the parallel universe?
Wormhole may be the most direct way. Through the wormhole, you can go to different time and space and enter different universes.
Scientists believe that wormholes are closely connected to black holes, because in theory, black holes can tear up space and space and stretch space to the extreme, just like creating a hole in the space-time structure to lead to another universe.
Of course, in theory, humans can also create wormholes, but they require great energy and at the same time, they need the assistance of "negative energy" to avoid the collapse of the wormhole.
Currently, humans are still quite far away from real wormholes, but they are indeed achievable in theory. It is only a technical issue at the moment.
If one day in the future, scientists really create wormholes that can be crossed, would you try time and space travel like this?
