Video spoilers history, starting with the blitzkrieg on Poland

And a new day, a new sky appears.

The vast universe comes into view, and the dark background is so deep that there is no end in sight.

The camera is pointed at the Earth.

Zoom in, zoom in again!

The outline of Xianyang Palace Square emerged.

The picture shows the scene of the young Qin Shihuang's enthronement ceremony.

And the sky began to slowly tell the story:
[If you were standing on a planet more than 2000 light years away, could you use a super telescope to see Qin Shi Huang ascend the throne? ]

【Or ask it in another way. 】

[More than 2000 years later, if we teleport to a place more than light years away, can we see the scene of Qin Shi Huang ascending the throne? 】

[At first glance, this question seems a bit outrageous, right? ]

Outside the sky.

Qin Shihuang saw this problem.

I couldn't help but smile.

"That's an interesting question."

Ying Zheng raised his head slightly.

"Well, my people from more than 2000 years later will see me ascend the throne."

"At first glance, this question does seem a bit outrageous."

"After careful analysis, it is indeed a bit outrageous."

"Time has already passed, and it is impossible to go back. How can I let future generations see me?"

Ying Zheng, who has already mastered a lot of knowledge through studying under Tianmu, estimates that this is impossible.

But nevertheless.

Ying Zheng continued, "My coronation ceremony is a grand event for the world. If it can really be seen by people from distant planets, it will demonstrate my majesty."

“If it could be seen through the sky curtain, future generations, people inside and outside the earth, could see it.”

"Not bad."

And in the Ming Dynasty.

Zhu Yuanzhang also said happily:

"When I was herding cattle, I couldn't even see the smoke from cooking fires ten miles away. How can you say two thousand light years away?"

"Don't mention that Ying Zheng lived thousands of years ago."

"Even if Ying Zheng is ascending the throne right now, people thousands of light years away definitely won't be able to see it."

……

Basically, the ancients thought this question was very simple.

The answer was also very decisive.

And the sky continues.

[The question sounds a bit far-fetched. ]

[But don't worry, when we turn our eyes to the vast universe, we can combine the knowledge of optics and astronomy. ]

【You will find that this question is not metaphysics. 】

[First, we need to understand the relationship between light, distance and time. ]

[The speed of light in a vacuum is the fastest in the universe, about 30 kilometers per second.]

[A light year is the distance that light travels in one year, which is far beyond imagination.]

[One light year is approximately equal to 9.461 trillion kilometers. ]

【According to Einstein's theory of relativity, the speed of light is the ultimate speed limit for information transmission. 】

[That is to say, the sun we see now is what it looked like 8 minutes ago.]

[And Proxima Centauri, which is 4.3 light-years away from us, is actually receiving images of the Earth in 2021! 】

[This is the famous "Destiny is within the light cone"! ]

【So 2000 light years is the distance that light has to travel in the universe for 2000 years.】

【Qin Shi Huang lived in the Qin Dynasty more than 2000 years ago. 】

[When he was issuing orders in Xianyang City, building the Great Wall, and commanding thousands of troops. ]

[The scene around him will reflect light and spread in all directions. ]

[In theory, these rays carry the information at that time and will continue to fly towards the depths of the universe.]

【If it is more than 2000 light years away from the Earth. 】

[There is a super powerful "cosmic telescope" that can capture these lights from the earth and see from the time correspondence of light propagation. ]

[It is possible to see what happened on Earth more than 2000 years ago, that is, the scene during the Qin Shihuang period. ]

……

Outside the sky.

Northern Song Dynasty.

Shen Kuo stood in his own courtyard, looking up at the sky, concentrating on reading this passage on the theory of light propagation.

When they saw the picture on the sky curtain, the alien people of later generations were observing the scene of Qin Shihuang's enthronement.

Shen Kuo couldn't help but applaud.

"Great, wonderful!"

"It turns out that light in the world is so wonderful that it can carry things from the past and fly into the depths of the universe."

"I really didn't expect that this light could do such a magical thing! It could transmit the scene of Qin Shihuang thousands of years ago to light years away!"

“The light leaves traces behind, just like the sound of a wild goose.”

And in the Ming Dynasty.

Xu Guangqi's face was also full of amazement.

"This is incredible. If we could really see Qin Shi Huang commanding thousands of troops, it would be such a spectacular scene!"

"but……"

Xu Guangqi played with the imported telescope in his hand.

I used a telescope to observe the distant scene.

"But it is easier said than done to capture the faint light from Earth more than 2000 light years away."

"What kind of powerful observation equipment is needed for this?"

"Maybe, this possibility is just a possibility after all, right?"

The sky curtain also continues.

【But the reality is not that simple. 】

[During the 2000 years of light propagation, it encountered countless difficulties and obstacles. ]

[The universe is not an empty vacuum, it is filled with various interstellar materials, such as dust and gas clouds. ]

【These substances absorb and scatter light. 】

[To use an analogy, light is like an athlete running in the universe, and interstellar matter is the numerous obstacles set on the road. ]

[Although dust particles are tiny, they are numerous and absorb energy from light, weakening its intensity.]

[The gas cloud will change the direction of light propagation, making the light deviate from its original trajectory like being drunk.]

[When passing by a black hole, it will be distorted into a funhouse mirror by the gravitational lens effect]

[After such a long time and such a long distance of propagation, coupled with the interference of interstellar matter. ]

[By the time the light from the Earth reaches more than 2000 light years away, it has become extremely weak, and the information it carries has become fragmented.]

[Even if we have extremely powerful telescopes that can capture these faint lights, it is still a huge challenge to analyze these lights and restore them into images.]

[The Hubble Telescope observed the Pillars of Creation Nebula 2000 light years away, but could only see fuzzy clouds.]

[To see a person on Earth more than 2000 years ago, the difficulty is simply a world of difference. ]

[Because the light reflected from the earth is too weak compared to those powerful light sources in the universe. ]

[Moreover, it is difficult to extract the image of Qin Shi Huang from such weak and chaotic light.]

[The technology required is far beyond our current capabilities.]

【From another perspective, the earth itself is also constantly moving. 】

[For the past 2000 years, the Earth has not only been orbiting the sun, but also rotating on itself. ]

[At the same time, the entire solar system is also orbiting the center of the Milky Way at a speed of about 220 kilometers per second.]

[This means that the light emitted from the earth more than 2000 years ago, during the propagation process, the earth has moved to a different position. ]

[The light rays that carry the information from the Qin Shi Huang era do not travel straight in a fixed direction.]

【Instead, it follows the movement of the Earth, drawing a complex trajectory in the universe. 】

[Therefore, it is extremely difficult to capture these lights more than 2000 light years away and match them with the earth.]

[It's like looking for a specific grain of sand in a vast desert.]

[So, what if the observer is really that awesome? ]

[What if aliens can really collect all the photons to form an image? ]

[Well, if there really are humans or aliens who have invented super-incredible technology, they can really achieve this kind of long-distance, high-precision observation. ]

【What they saw was Qin Shi Huang. 】

[It is just a "video" carried by light. ]

[Even if alien civilizations observed Qin Shi Huang ascending the throne at this moment, by the time they sent spacecraft to Earth to confirm it, thousands of years would have passed for humans.]

[Maybe they have already entered interstellar civilization. ]

[This is like using a courier tracking number from 2000 years ago to check a current package - all you'll see are historical fragments!]

【We can theoretically see into the past.】

[But it is impossible to change the past, nor can it interact with that era. ]

[This is the conjecture about whether we can see Qin Shi Huang ascending the throne from more than 2000 light years away.]

【Although it is almost impossible. 】

【But it’s not completely impossible. 】

[This idea also reminds us that the universe is like a huge time capsule, and every beam of light may be a recorder of history.]

【The starry sky we see is actually a museum of the history of the universe. 】

【By exploring the distant universe, we can intercept distant photons.】

【We may be able to peek into the secrets of the past and understand how the Earth and humans have changed over the long ages.】

[The image of Qin Shi Huang's enthronement may be being observed in some distant galaxy, but humans will never be able to verify it in person.]

[This may be the most poetic cruelty in the universe! ]

The video ends here.

Barrages of comments also appeared one after another.

《Ah? You can really see it?》

"It's very simple. The Proxima you saw was also more than 4 years ago. If the technology of creatures 2000 light years away can clearly see things on Earth, then you can understand it this way."

"So what the aliens saw was fake, right?"

"Wrong! If aliens are watching Qin Shi Huang ascend the throne, then what they see is real, both in the past and in the present."

"My brain is going to burn."

"Da Qi and Daliang both exist!"

"I don't like this theory. It's like saying the past and the future have already been determined."

"First, you have to be able to accurately capture the photons that carry Qin Shi Huang's ascension to the throne from 2000 light years away."

"It is possible to see Qin Shi Huang, but it is unlikely to see Qin Shi Huang."

《Live broadcast now: Qin Shi Huang ascended the throne——Network delay: 1314520……………… milliseconds.》

"You turned on DLSS999 to stitch together the frames in this live broadcast, right?"

"Then here is a question, can I see myself before I set out?"

"Then you have to go faster than the speed of light."

《Zulong! To you two thousand years ago!》

And the ancient people outside the sky.

I also think that this content about the speed of light and time is very magical.

Qin Dynasty.

Ying Zheng slowly said, "My coronation ceremony has become an image that can be spied on in the universe?"

"The power of this light is so magical and terrifying."

Li Si bowed slightly and said with great interest:

"It's not clear yet whether there are really aliens."

"I don't know if there are aliens spying on our Great Qin."

"This is a mysterious thing between heaven and earth."

"But in my opinion, it would be best if aliens could see it."

"This also demonstrates your majesty's great achievements, which will be known even across the vast starry sky."

Ying Zheng smiled with great satisfaction after hearing this.

All the officials of the Qin Dynasty at the scene echoed and said, "Your Majesty, great achievements! Across the stars!"

"Your Majesty's great deeds! Across the stars!"

tomorrow.

Zhu Yuanzhang was just watching for fun.

Even making fun of himself.

"Perhaps people in later generations are still watching us begging for food."

"From beggar to emperor."

"The more people who know about this, the better."

But while feeling relieved, Zhu Yuanzhang suddenly thought of a possibility.

He asked Liu Bowen with a little concern.

"The light in the universe can actually spread the news of our Zhu family so far."

"What if aliens deliberately tamper with the images transmitted by the light to confuse people? How can we distinguish the real from the fake?"

"Then spread those fake images, such as the fake content of our Lao Zhu selling hooks, all over the universe."

"It spreads thousands or tens of thousands of light years."

"It was even seen by other people in later generations."

Liu Bowen was also stunned by the question.

I can only say: "This touches upon my blind spot in knowledge."

"Maybe, there are no aliens at all?" (End of this chapter)