Standing 2,200 light years away and looking at the earth, can you see the ancient Qin and Han dynast

A light-year is a unit of distance, it's not a unit of time, it's not a time when you stood 2,200 light-years ago and you were able to see the Qin and Han dynastiesIf you want to really be able to see the past for a long time, you need to do it when the light is retrograde, retrograde, it's a certain velocity ratio, and you can see the things that must be in the past. <>

It's a light-year away, you can't see the Earth a year ago, just like if you stand a light-year away, you can't see the Earth a month and a half ago, you can shrink this infinitely, if this theory is true, does it mean that you are standing in a very small part of the light-years away, the scene you see is the scene from a long time ago, it is impossible for people to see the scene of the past, the speed of light is very fast, fast enough to far exceed the effect of human visual delaySo although there is a certain delay in the scene, this delay is negligible in the eyes of people. <>

If you want to really see the scene of the past, that is, you can see the past, but you can't change the past, just like watching a video to see this kind of scene, you need to do when the light is retrograde, for example, when the light is a car, when we are still in place, he travels past us very quickly, if we follow it in the opposite direction, at the same speed as it, we can see the past him, because when the two pass by, the speed will double, or even higher, so you can see some things from the past，But no one knows whether this theory will succeed or not, because there are no realistic conditions to test it. <>

People are always curious about the history of the past, but from the current theory of scientific and technological development, it is difficult to really see the past, and you see it this time, you can't change what can see the past and be able to change the past are completely two concepts, seeing the past, it may just be that you see some scenes that happened in the past, but changing the past is a secret that can only be accepted by a higher dimension,For example, when you go to the sixth dimension and the seventh dimension, you can see countless forks in the timeline, countless parallel spaces, and of course, this is very complicated.

At such a distance, even the sun may not be visible, let alone the earth, which reflects the sun's rays. The restoration of the Qin and Han dynasties is only the imagination of human beings, and if the future technology really reaches a certain level, it may also turn imagination into reality.

No. Because there are many planets that block light within 2,200 light years, it is impossible to see the ancient Qin and Han dynasties.

Theoretically, it can be seen, but not only does it need to reach the speed of light and be stable, but it also needs to have a super telescope, otherwise you can't see it clearly.

If you look at the earth from 2,200 light-years away, you can't see the ancient Qin and Han dynasties on the earth, because 2,200 light-years is not the period of the Qin and Han dynasties.

Author: Fusu.

Traveling through time and space has also been an important topic for a long time. Some people even say that standing more than 2,000 light years away, we can even see the glorious Qin and Han dynasties. This goal could be achieved more quickly if the area was accurately reached and the Earth was observed.

Scientists have questioned the unrealistic nature of this idea, as it is not enough to travel through time and space in a variety of ways.

As a unit of distance, the light-year does not have the function of spanning time and space

As early as primitive times, people knew how to calculate time according to the alternation of day and night, and measured the approximate duration of all work, and thus came the biological clock, etc., and many living things existed in similar states.

Although this idea is very common, there is no real time in the strict sense of the word. Especially in Einstein's theory of relativity, everything is relative, all moments are equal, so there is no past, present, and future.

As a unit of distance, the light-year does not have the function of spanning time and space, and the activity of galaxies or celestial bodies tens of millions of light-years away is only a lag after the phenomenon occurs. It takes tens of millions of light-years for light to reach the earth until it is caught.

So if you want to stand more than 2,000 light-years away and see the Earth at that time, the results are not surprising. This is because the earth does not change its own light, and it does not leave any images of that time.

The past, present, and future do not exist in the physical sense

In fact, the so-called past, present, and future are completely non-existent in the physical sense, and all the time we experience is a strange illusion. From Newton to Einstein, many physicists believed in this statement, but no one was willing to truly accept reality.

But photons also keep escaping, and in the thousands of years of activity of the earth, photons also disappear with the passage of time. Therefore, even if we have the relevant technology, it is difficult to find the complete photon information to recover.

Standing 2,000 light-years away, although it is really insignificant compared to the diameter of tens of billions of light-years in the universe, our current technical means still can't reach that far.

Time plays a role similar to a chain, and it is unrealistic to travel through time and space

In Newton's laws of motion, time plays a role similar to that of a chain, and all motions are connected by time in a sequential order.

Later, some physicists extended Newton's statement and came to the conclusion that Newton's laws of motion were applicable to both forward and reverse time, which provided a certain theoretical basis for Einstein's theory of relativity.

The discussion of time never stops, because it is not only a physical change, but also the boundaries of the concept of time are of great significance to the development of philosophy and human society as a whole.

From the point of view of physics, time cannot exist alone as a unit or dimension, and gravity can have a huge impact on time, which is called "time travel".

Space travel has always been a topic of curiosity, and these two events have influenced all kinds of people for thousands of years. But some people say that as long as you stand for more than 2,000 years, you can see the Qin and Han dynasties, and you can observe the earth, and your goal will be achieved. But in reality, this idea is completely unrealistic, and it does not have the ability to cross time and space.

Scientists have also specifically questioned this, because it is impossible to cross distances now because of the various conditions that need to be met to cross time and space.

First, it is unrealistic to use light years as a unit of distance, and the key is not the ability to cross time and space. In fact, as early as the primitive times before that, we already knew how to use day and night to calculate time and measure work, and we also made a biological clock. It's a similar situation with a lot of creatures now, but the concept is more common and not really time.

In Einstein's theory of relativity, everything is relative. If you take light years as the distance unit, there is no way to cross time and space, and tens of millions of aliens or some celestial activities before the Chinese New Year can be observed, which is only a lag after the phenomenon appears.

Second, in fact, it has been a long time since we went directly to Earth and were captiveIt would take about a few thousand light years. If you want to stand for more than 2,000 years and see the results of the earth, there is no way to surprise people, because the earth itself does not say that there are some changes, and there will be no images left, the past, the present and the future do not exist in a physical sense, and everything in the present is an illusion.

3. Photons can record everything, but they can't capture the activity of photons. If you want to recreate the original scene, you have to record it. The invention of the camera was based on the relevant principles.

Photons are actually constantly passing away and disappearing, and will cease to exist over time. Standing more than 2,000 light-years away, although it is tiny compared to the diameter of tens of billions of light-years in the universe, our current technological means still can't reach that far, and time plays a role similar to a chain, and it is unrealistic to travel through time and space.

Yes, it is true, if we can exceed the speed of light, then standing in the place more than 2,000 years ago, we can see the glorious Qin and Han civilizations.

Depending on what tools are used, the human eye must not see them, with the help of astronomical instruments, aliens can.

No, it must not be visible, the human eye does not have that far vision.