If you look at the earth 1,000 light years away, can you see the Song Dynasty 1,000 years ago?

Theoretically, if you stand 1,000 light-years away.

It is indeed possible to analyze and spy on the state of the earth 1,000 years ago and see what has happened in history, of course, this is different from time-traveling, we just see what happened in the past, and we can't change what has happened.

The things that humans see are actually the results of the reflection of light from objects, after entering the eyes, and the results of analysis after our brain calculations, the propagation of light takes time, so everything we see has actually happened, but this time difference.

It's too short for our brains to tell the difference. It takes about 8 minutes for the sun's rays to reach the earth, and the sun seen by humans is actually the sun 8 minutes ago, which is equivalent to human beings transcending time and seeing the past.

During the Song Dynasty, a ray of light was refracted and he went directly into space without any obstruction, and has been propagating a distance of 1,000 light years, and if there is a creature or technology that can receive this ray of light and restore the information contained in this ray of light a thousand light years, it is equivalent to seeing what happened 1000 years ago.

However, a theory is a theory after all, and there will be many obstacles in the propagation process of light, and after repeated refraction, the information contained in it has been changed, and what we can see is the state of information reflected in his latest refraction. It is the light received by human beings on the earth, many of which are refracted on the surface of the earth many times, but we do not see the initial information contained in any light, which shows how difficult it is to see history beyond the speed of light, although the probability is very small, but the probability of this happening is not 0, maybe human beings can one day catch up with the speed of light through technology, and finally see the past history, although this is not meaningful, but it can reflect the power of technology.

OK. The propagation of light in the universe will not change, and it is theoretically possible to see the Song Dynasty 1000 years ago, provided that you can receive the light 1000 years ago.

According to the scientific explanation, it is possible to transmit the image to 1000 light years away or even beyond, but it cannot be changed because it has already happened, and what is seen is only the image.

According to Einstein's theory, what we see is actually things that have passed. If you go beyond the speed of light, then you can go back in time. Theoretically, you can see the Song Dynasty 1,000 years ago.

Theoretically, it is possible, and it must move at the speed of light and light at the same time, and it is relatively stationary with the light of 1000 years ago, which is possible, but it is not possible with the current technology of mankind.