Li Guanghan continued: "Lao Du, this is not like the starry sky map of the current season. The "Autumn Quadrilateral" and the M-shape of Cassiopeia near the North Celestial Pole are completely invisible. Nor is it a contemporary sky map. The tail extension line of the contemporary Big Dipper points to the direction of the Great Horn and the Horn Su, and the tail extension line of the Big Dipper that we see now points to the direction of Xuan Ge and Swagger, and it can be extended to the Antares. This is the Nine Star Chart of the Big Dipper from the pre-Qin period and even earlier. Why did the ancients call one of the two extra stars the hidden element, which means that all the original information is completely hidden. It is not known that the energy of the star disappears after the supernova explosion, and it completely retreats into a black hole. ”

"Lao Li, you mean that we have traveled to the ancient times where you can see the Big Dipper? How is this possible? Lao Du said that he didn't believe it, but his face was obviously flustered.

Li Guanghan looked up at the starry sky and said: "I once saw a map of the ancient starry sky of Dunhuang, and I remember that it recorded that about 100,000 years ago, the shape of the Big Dipper was more like a spear. You see, are they now arranged in a way that is somewhere between a spear and a spoon? After 100,000 years, they will evolve into the glyph 'self'. ”

"Huh?! So you say we're under the stars tens of thousands of years ago? There is no human society formed outside, can we go back? Lao Du no longer cares about how many stars the Beidou is, what form it is, he cares about whether it has really crossed over, where it has crossed, and whether he can go back.

Lee Kwang-han did not answer, and did not know how to answer. Time is position, position is time, and this perspective of God can only be explained with the wisdom of four-dimensional space.

He looked at the twenty-eight constellations in the starry sky, and suddenly remembered the "Four Elephants Xuanniao Gold Foil" unearthed from the Sanxingdui site, which must have been drawn by the ancients by observing strange and magnificent celestial phenomena with rich imagination. Li Guanghan was even a little excited to be able to admire the four big birds flying in the night sky with the ancients. These memories that were imprinted in the depths of his brain to represent the Huaxia race were activated and added infinite inner power to him.

Lao Du couldn't stand Li Guanghan's calmness, he thought he was an eternal literary and artistic youth, but he didn't expect Li Guanghan to be able to look at the stars endlessly with interest at such a moment.

Lao Du looked at the red luminaire that he had placed when he came, and the red halo was still there, shining in the dark night. This is the crystallization of modern civilization, has they also crossed? What is there to go back to 10,000 years ago overnight.

Lao Du quietly approached Li Guanghan who was looking up at the starry sky, Li Guanghan turned his head sharply, grabbed Lao Du's hand, pointed to the sky with the other hand and said: "Look, there is another evidence to prove my conjecture, we really traveled back to 10,000 years ago." ”

"Sirius, this Sirius in the southern sky is still red and not very bright, unlike our contemporary Sirius, which is blue-white and radiant. It means that it has not yet moved closer and closer to the solar system as it does now. The Western astronomer Ptolemy once said that in ancient times, Sirius was red. ”

Lao Du was so clutched by the excited Li Guanghan that he could only pretend to watch it along. "Lao Li, isn't Sirius in the northwest direction? There is a poem as evidence, Su Dongpo once talked about juvenile madness, and sang a song 'Will hold the bow like a full moon, look northwest, and shoot the wolf.' You read that wrong. ”

No, no, the carved bow in the poem refers to the nine stars of the arc, which is located southeast of Sirius, so the arrow points to Sirius in the northwest. This direction is relative, not the direction in which Sirius is seen from the ground, you misunderstood. Li Guanghan corrected. Lao Du, we are really under the stars in ancient times now. ”

Lao Du had no intention of discussing the starry sky again, he was also frightened by the evidence in front of him, and he had no intention of anything else for the time being. If you can't go back, everything will be clouds. Lee Kwang-han is his only companion and his own dependence. Lao Du opened the thermos cup and took a sip of hot water, and anxiously asked Li Guanghan what he planned to do now.

Li Guanghan was not so anxious, he was sure that since he could come, he would definitely be able to go back. It's just why he can come here by chance, and what does the "Wise Man Happy Water" want to tell him? Is there something you want him to accomplish?

Thinking of this, Li Guanghan patted Lao Du on the shoulder and said, "Don't worry, even if we can get out of the valley now, we don't know if there are humans outside, so let's see what secrets this valley in ancient times has." ”

Just as their attention was focused on the sky, the surface of the miraculous lake beneath their feet was slowly descending, and the dreamlike blue ice water slowly disappeared from the cracks in the rocks. As the water level descends, the last layer of blue ice water recedes from the edge of the metal disc, and the huge metal relief disc at the bottom of the lake gradually reveals its true face. The metal disc is the same size as the basketball court, with the same nine-eye pattern as the translucent lens, and a circle groove in the center. The "Wise Man's Joyful Water" flowed back into the groove in the center, waiting quietly, shining with a faint silver light.

The distance between the huge metal disc at the bottom of the lake and the ground is about 30 meters, and Lee Kwang Han is eager to try it. He turned back to Lao Du and said: "After all, the divine water will live in the metal plate in my hand, it is our guiding light, and with it, we can come back as we want." Lao Du, you pull me, I'll go down and take a look, and then bring the divine water up. ”

Lao Du readily agreed, and they pushed a big stone together, tied one end of the climbing rope to the big stone, and tied the other end to Li Guanghan's waist.

Li Guanghan dragged the climbing rope and pedaled against the rock wall, moving down step by step. The sound of rolling torrents of water can be heard from the slippery rock wall, and you can feel the trembling of the rock wall on your toes, as if there is a great river behind the rock wall.

Is there an underground river down here? All the ice water just now flowed into the underground river? The further down he went, the more he could feel the heat wave coming from the metal disc, and it was almost there, he thought to himself.

It turned out that he was thinking too simply, and the depth of 30 meters he visually measured on the ground was a complete illusion. In the face of a strong gravitational field, the refraction and bending of light caused him to misjudge the depth of the lake's bottom, which is actually bottomless.

The huge metal disc and the "Wise Man's Pleasure Water" in the central circle always suddenly became out of reach when he saw it close at hand.

The 50-meter-long climbing rope has been used up, and Li Guanghan is still hanging in mid-air, the heat is steaming under his feet, and there is still some distance to look down through the heat. How deep it is, Li Guanghan no longer dares to visually detect.

Lao Du stood on the ground and shouted, asking loudly, is it the end? I've run out of rope.