When the two of them came to the window, the campus was a deep twilight, and the dim yellow street lamps were lit up far and near, reflecting the hazy mist.

Huang Shang pointed to the street lamp and said: "Assuming that the luminous intensity of these lamps themselves is the same, then the closer the lamp is brighter, and the farther the lamp is darker, and the relationship between brightness and distance constitutes a strict equation." If we know how far a lamp is from us, we can calculate the entire distance. ”

Zhou Liang pondered and said, "I agree, you also found such a street lamp in the universe?" ”

Huang Sheng nodded.

Zhou Haoqi asked, "What is it?" I also have a little knowledge of physics, street lamps have the same structure, share voltage, and have the same light intensity, where is there such a standard reference in the universe? ”

"Yes," Huang Shang laughed, "I call them supernovas." ”

Zhou Liang was stunned, thought for a long time, and said, "I've never heard this word, what is it?" ”

Huang Shang smiled: "You've seen it, but it's not called by this name." In October, there is a guest star out of the south gate, as big as a hat, bright and colorful, gradually shrinking, the following year in June. ”

Zhou Liang lost his voice and said: "Hou Han Shu? ”

Huang Shang said: "Not bad. I looked through the astronomical and meteorological observation records of the previous dynasties in the library of the Qintianjian Library, and found this paragraph in the Book of the Later Han Dynasty, a star suddenly appeared in the sky, which lasted for eight months, and it was unlikely to be a comet......

Zhou Liang said while thinking: "Once during the Song Jianyan period, there was also a ...... in Houliang" He thought about it, and actually said four of them, Huang Sheng admired it greatly, and said with a smile: "It should be a true god." The descriptions of these records are all similar, and I suspect that they may belong to the same astronomical phenomenon, so I looked into it and found a possibility. ”

"What is it?"

"The death of a star blooms in a flash, and I call it a supernova explosion."

Zhou Liang shook his head and said, "The stars are eternal, how can they die?" ”

It is the star power that the immortals cultivate, and most of them have an inexplicable awe of the stars, Huang Sheng understood this, and said: "Compared to life is only a hundred years, the stars are indeed almost eternal, but they are not after all. Tan Gong once said that everything that exists will eventually perish, and how can stars be an exception? ”

Zhou Liang sighed and said, "Regardless of this, how can you be sure that their light intensity is the same?" As far as I know, the stars are big and small, and they are not the same. ”

Huang Shang said: "I built a mathematical model of stars, tried many conditional parameters, and found that not all stars can become standard street lights. Zhou Liang, do you know that there are two types of supernovae, the first type occurs in a binary star system, where one star pours material into another star, and when the latter's mass reaches a certain value, it is difficult to maintain its original form, and it can only declare its existence with the strongest explosion. The structure of the stars is the same, and the fixed value is universal, equivalent to voltage, so the light intensity of such supernovae is very close and can be used as a standard reference. ”

Zhou Liang listened like a book from heaven, sneered slightly to show disdain, and shook his head again and again. Huang Sheng sighed: "When ordinary people hear strange theories beyond imagination, their first reaction is nonsense. It turns out that Zhou Liang is not exempt from vulgarity. ”

Zhou Liang snorted and said, "Not to mention how to calculate the fixed value, only your star model is likely to be very wrong." I also know a little about some scientific developments, which are roughly divided into three steps: discovery, observation, and research, you have discovered supernovae, but people on the ground, how to observe the stars? It's the sun, which seems to be just a big fireball, with no details, how to build a model? Without observation, how can it be studied? It's just delusional. ”

Huang Shang has a way to observe the sun, using the telescope sent by Weixi. This thing is so sharp that you can even see the details of Saturn's rings at night, not to mention the sun that is much closer? But he didn't want to be exposed, so he just laughed it off.

"When you become an immortal and can receive star power, you will naturally know why I said that you are wrong," Zhou Liang shook his head and said, "Don't mention this." President Yan intends to invite Marie Curie to Yan University for exchanges, and has communicated through the French Academy of Sciences, and there are about six or seven percent of the quasi-believers, and we may have two translators to accompany him at that time. Several of her students are also said to have been invited. ”

Vesy is coming too? Huang Shang's heart jumped and asked, "When is it?" ”

"It's about next summer and autumn, and I don't know if there will be a war at that time...... Zhou Liang shook his head and sighed: "Look at people, if you get inspiration, you will do experiments, and speak with facts. "I look like I hate iron but not steel, and I just have to say the words "ambitious".

After getting acquainted, Huang Shang had already discovered Zhou Liang's poisonous tongue attribute hidden under his cold appearance, and snorted: "What should I do for an experiment, pick a sun?" Macroscopic research is different from micro, the scale is several orders of magnitude larger, how to do the experiment? ”

The two mocked each other a few more words, and Huang Sheng said with a straight face: "Don't talk about those who don't have it, I have something to do with you." I would like you to tell Tan Gong that there is likely to be a flood in the Yellow River next spring. ”

Zhou Liang was startled, seeing that his expression was solemn, not like a joke, and asked urgently: "How do you get it?" ”

Huang Shang said: "There was only such a light snow this winter, and I compared the meteorological records of previous years and found that if there is too little precipitation in winter, most of the problems in the Yellow River will occur the following year." ”

Zhou Liang said: "How likely is it?" ”

Huang Shang said cautiously: "Before the river disaster in previous dynasties, there was very little precipitation in winter, and the probability this time is seventy percent. ”

At this time, the two had come to a secluded corner, Zhou Liang walked back and forth a few steps, his boots rubbed the ground, Huo Huo made a sound, raised his head and said, "The information is on you?" ”

Huang Sheng nodded, untied the schoolbag on his back, and took out a thick pile of materials: "The recorded data are all here, which is a bit cumbersome, and finally my comparative analysis." ”

Zhou Liang looked at it carefully, his face was heavy, and he stumbled and said: "Such a big thing, why don't you say it earlier, come with me to see Tan Gong." ”

Because he may be the same traverser, the other party's strength is enough to crush him, and he can't be sure of his attitude, Huang Shang has been reluctant to see Tan Sitong, for fear of accidentally exposing it. But this matter is not trivial, so I can't care so much. At the moment, he didn't go downstairs to pick up the bicycle, Zhou Liang directly stretched out his hand to the sky, summoned a starlight, wrapped the two of them, flew out through the window, broke through the sky and traversed the thousand-year-old city, and landed directly in a large mansion in the northeast of the capital.

This mansion occupies a very large area, and the yellow clothes look at it in mid-air, but when you see the brilliant lights, the pavilions stretch, the pavilions are dotted, the direction of the building seems to have great meaning, and there are several silver threads of living water meandering through, interspersed with them, cleverly connecting the whole mansion into a scattered and coherent whole, which is extremely clever.

Before it fell, seven or eight starlights surrounded it, and one person shouted: "Who is bold, dare to fly in the capital, trespass into Tan Mansion, and capture it quickly!" After seeing the appearance of the two of them clearly, he hurriedly smiled and said: "Forgive the sin and forgive the sin, it was Zhou Lang in person, I don't know what the important thing is?" ”

Tan Sitong has no children, Zhou Liang is tall and proud, and he is deeply favored by several ladies, almost equivalent to the young master of Tan Mansion, saying one thing, scattering all the guards, descending to the front of the main hall, and stepping into it.

Huang Sheng took a deep breath and followed.