Can humans build a time machine by the 22nd century?

Time travel is possible, but only to the future, not to the past. Einstein realized that the more massive an object is, the slower the time in its vicinity. Humans may be able to use this to create a time machine one day in the future.

Since the faster the speed, the greater the mass, it is likely that the time machine of the future will be a near-light-speed traveling machine. The reason is simple: you sit in a time machine, and it starts to fly around the Earth, faster and faster, and soon reaches 99% of the speed of light, which is the limit of speed, and Hawking said that when the speed reaches 99% of the speed of light, a day in the spaceship will be a year on Earth.

If you enter the time machine in 2020, after flying at 99% of the speed of light for a year, you will find that you will not be able to find your home when you step off the spaceship, because in the time machine, your day is equivalent to a year on Earth, and in your year, 365 years have actually been spent on Earth. You, on the other hand, have been moving forward into the future for 365 years.

There is also a theoretical time machine, which is all-natural. It's a black hole!

If we have a way to quickly reach the black hole of the Milky Way**, and can orbit the black hole without falling into the black hole, because the black hole is extremely massive, people in the vehicle near the black hole will find that it takes only 5 days to circle the black hole, while in the eyes of the earthlings, they orbit the black hole in 10 days! The spacecraft orbited the black hole for 5 years, and on Earth it took 10 years. When the people on the spaceship arrived on Earth, everyone on Earth was 5 years older than them, and they were back on Earth in the future!!

To sum up, in order to create a time machine, we just need to be very fast, very, very fast, and if we want the effect of the time machine to be more obvious, we must also reach more than 20% of the speed of light!

It's the 21st century, and the fastest speed that humans can achieve can't even reach 1% of the speed of light..

While I'm confident in a time machine, I don't think humans will be able to reach more than 20% of the speed of light in the coming centuries.

However, anything is possible.

Theoretically, it can be made now.

There is always a gap between theory and practice.

At present, it is impossible to construct a space-time machine in the confirmation theory, and many theories about the space-time machine now contain unverifiable conjecture theories.

Our best understanding of time comes from Einstein's theory of relativity. Before the advent of the theory of relativity, time was generally considered to be both absolute and universal, and that it was the same for everyone, regardless of the physical environment. In his special theory of relativity, Albert Einstein proposed that the time interval between two events we measure depends on how the observer moves.

It is important to note that two observers doing different movements perceive the same two events, and the time that passes between them is not the same.

Brian Green, a physicist and best-selling author at Columbia University, said that many people have had the idea of time traveling, either to reunite with a deceased loved one or to stop the horrific killings. Time travel is a beautiful wish, and it provides wonderful material for all kinds of science fiction**. There have been countless ideas about how to go back in time.

These assumptions, if carefully scrutinized, are playing a side game with physics. In our view, almost none of these assumptions are true. ”

This is still inconclusive, but just imagine, if you can make it, you can't go back to the time and space before the time machine was created, because the time machine has not happened yet, so if it is created, at most it can only go back to the time and space after the time machine was created.

With the development of science today, the field of research has advanced to the two extremes of maximum and minimum. However, whether it is in the deep space of the universe or inside the nucleus, we cannot verify it ourselves. The answers given by these theories may be even more absurd than a blind man touching an elephant.

It's like quantum theory, when I look at you, you collapse into what I see, and if I don't look at you, you disperse behind me. Is this the truth of the theory or the absurdity of our thinking?

In terms of the current physical knowledge of human beings, it is unrealistic to travel through time and space, but Einstein proposed that time can stop when an object reaches the speed of light, and some scientists have proposed that even if it exceeds the speed of light, it can only reach the future at a high level, and cannot go back to the past. In short, we can only dream now, maybe one day it can really be realized, but we are afraid that we will not be able to catch up.

See how you ask for a time machine.

If you want to go back to your past and go faster than the speed of light, it's that you will see your past self like you are watching a movie.

If you want to touch it, the theory can't be realized yet.

If you want to see the ancient galaxy, Hubble has made it happen.

This, Doraemon, have seen too much???