Chapter 82 It is 130,000 kilometers away
As soon as Wang Ning finished speaking, the 725 amateur radio station on the coffee table began to radiate electromagnetic signals. It converted pictures into sounds, and hid the sounds in radio waves that human ears could not capture. This was a whisper that humans could not capture or understand, but the magical thing was that it was actually an image. Converting images into sounds might be hard to imagine for ordinary people, but for people who have mastered information coding technology, information is information, and carriers are carriers. As long as the essence of information is understood, it is not difficult to separate it from the carrier. Since humans carved murals in caves with chisels hundreds of thousands of years ago, images have become carriers of visual information. They have developed from rock walls to clay tablets, canvases, straw paper, and photosensitive films. After thousands of years of vicissitudes, the relationship between the two seemed to remain unchanged until the fire of the Industrial Revolution was ignited. Information theory brought about a revolution in the world. People can finally grab image information from the two-dimensional plane and stuff it into sounds, electric currents, and light waves. From then on, any information can be broken up and stuffed into any carrier.
To understand the nature of information is, in a sense, also God's power.
By mastering information, humans have taken another step towards becoming gods.
Bai Zhen was standing in front of the laptop screen, watching the photos being scanned from top to bottom bit by bit. What did this feel like? Like a lottery ticket, scratching off the strips one by one to reveal the picture behind.
At the beginning, the signal reception was poor, and only green snowflake noise was produced. Bai Zhen slightly adjusted the direction of the antenna to receive clearer photos.
"What's the situation?" Wang Ning asked.
"It's OK." Bai Zhen replied, "It's just a little slow."
A half-length photo of a Ugandan chimpanzee... bah, baboon is 15KB in size, and the transmission speed between the 725 and 705 being simulated in the living room is only about 1000bps, or 0.1KB per second. Under ideal circumstances, it would take 150 seconds, or two and a half minutes, to successfully transmit such a photo in its entirety.
But how can reality be so ideal?
After all, radio is radio, not cable or optical fiber. Using radio waves to transmit signals is convenient and simple, but you can no longer expect it to be efficient.
You can only have two of these three: convenience, simplicity and efficiency.
Therefore, the image transmission of amateur radio is unstable. When applied to network engineering, it means that packet loss is serious. If the antenna is not aligned properly, what is scraped out is a green snowflake-speckled belt. It is impossible to successfully receive a complete and clear picture in one go.
In order to ensure that the signal can be transmitted completely, Wang Ning's end will send multiple redundant signals. His 725 will send pictures in a continuous loop with a cycle of 150 seconds until Bai Zhen can receive a complete picture. So in Bai Zhen's eyes, the Lenovo computer in front of him is scratching lottery tickets repeatedly, and being able to scratch out a complete photo of himself is considered winning the jackpot.
"Wait... there's interference. Where is the interference coming from?" Bai Zhen scratched his head and looked around. "Is it the switch? Old Wang, wait a minute. I'll go turn the switch on and try."
He immediately ran to turn off the power switch, cutting off the electricity, and the room suddenly became dark.
"Is there a power outage?" Mom came out of the bedroom, holding up her cell phone with a flashlight. "Why is it suddenly dark?"
"Old Bai is out of service." Wang Ning sat on the sofa, his fat face illuminated by the green light of the CRT monitor. "We are doing an image transmission experiment."
"Just do the experiment, why pull the switch?" asked my mother.
"There is interference." Wang Ning replied.
In modern society, annoying electromagnetic interference is everywhere, such as the tower crane at the construction site next door, the security intercom at the entrance of the community, the electric car downstairs, and many inconspicuous small appliances in daily life, such as the power switches in the house. It is everywhere, all-round stereo interference, and it is impossible to avoid it. Bai Zhen can only turn off the power switch in his own home, he can't turn off the power switch in his neighbor's house, let alone the Meihua Villa community. This is how the electromagnetic environment in the city has deteriorated.
Some old HAMs like to have wild battles... no, wild fights, because of the clean and boundless environment. The good signal-to-noise ratio allows them to hear the sound of flies rubbing their hands on the other side of the radio waves.
After the power went out, Bai Zhen tried to receive the signal again.
"Is it better?" Wang Ning asked.
"No!" Bai Zhen said, "A dick."
"Go find the main switch of the community," Wang Ning said, "and cut off all the electricity in the community. This will stop the interference."
"Then I will be eaten alive by the property management?"
"Well, it's a special reason and a special time. Just tell them that they need emergency power. Unit-01 is using a positron cannon to fight the fifth angel on Purple Mountain. If they don't provide power, Rei Ayanami will die."
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Bai Yang was sitting in the dark wearing a sweater, with the radio plugged into the battery and the desk lamp on. The warm light stretched the darkness into a small circle, encompassing the desk, pen holder, radio and the boy's face. He held a microphone in one hand and a pen in the other, concentrating and writing furiously.
"Hmm? It's okay. The lights are just off. My dad and the others turned off the switch." Bai Yang held down the PTT and spoke, "They are doing an image transmission experiment. Miss, let's continue... Do you know Newton? Newton's law of universal gravitation, OVER."
"Newton?" The other end was confused. "What is Newton?"
"It's a person, a British, a great physicist." Bai Yang explained, "The F=G·(mm/r) your teacher wrote on the draft is the formula of the law of universal gravitation. Here F is gravity, G is the gravitational constant, the two m's are the masses of the celestial bodies, and r is the distance. It means that the gravitational force between two celestial bodies is proportional to the product of their masses and inversely proportional to the square of their distance. OVER."
"oh……"
The girl nodded, not quite understanding.
The monks are chanting and she is ringing the bell. It doesn't matter if you don't understand, just nod your head.
"I infer that your teacher was studying the relationship between the black moon and the earth at that time, so he wrote these numbers and formulas on the draft paper." Bai Yang said, "It's just that you couldn't understand it at that time, OVER."
“I don’t understand it now either.”
"It doesn't matter if you don't understand, I can understand it!" Bai Yang was very confident.
Bai Yang's confidence and courage are justified. He is a senior high school student who is about to take the college entrance examination.
At this moment, he was at the stage of his life when he had the broadest knowledge, the strongest thinking ability, and was well-versed in astronomy and geography, and history and politics.
"Let's sort out this data, Miss. Do you believe that I can infer the full picture of the Black Moon based on just the data of 1,200 kilometers?" Bai Yang said, "OVER."
The girl was stunned for a moment, "Really?"
"Really." Bai Yang nodded. "Miss, let's first look at 1,200 kilometers. This is the number that the teacher wrote on the draft of Journey to the West. We think it is the diameter of the black moon, right?"
Banxia nodded.
There are two numbers and two circles on this page of "Journey to the West" draft paper. The numbers are 1200 and 3476. The two numbers are marked next to the two circles. Banxia and Baiyang reached a consensus when reading this draft that the two circles are the white moon and the black moon, 3476 is the diameter of the white moon, and 1200 should be the diameter of the black moon.
"In your eyes, the black moon and the white moon are the same size?" Bai Yang continued, "Miss, is that so? OVER."
"Yes, they look the same size." Banxia nodded.
"Then I will know how far the Black Moon is from you..."
Bai Yang turned on his calculator and quickly made a draft on paper.
He has never been so diligent in his life. He was still doing math and physics when the power went out and the lights were turned off. His mother said that if he had this kind of enthusiasm in his studies, he wouldn't have to kowtow all the way from Purple Mountain to Xuanwu Lake to get into Nanjing University.
"The radius of the moon is 1,737 kilometers."
"The distance between the Earth and the Moon is 380,000 kilometers."
"The tangent should be 0.0045718..."
Half a minute later, Bai Yang got the answer.
"Miss, the Black Moon is approximately 131,239 kilometers away from you. OVER."
Banxia was surprised.
"How do you know that?"
"Radian, Miss, it's a very simple calculation. The white moon and the black moon are the same size in your eyes, so the radian angle when you look at them is the same." Bai Yang explained, "The white moon is 380,000 kilometers away from you and has a diameter of 3,476 kilometers. The diameter of the black moon is 1,200 kilometers. Using trigonometric calculations, it should be 130,000 kilometers away from you. OVER."
“That’s amazing.”
Although Banxia didn't understand, she thought it was amazing.
"Let's continue calculating. Now that we know the distance between the Black Moon and the Earth's surface, we can calculate the Black Moon's orbital period, the period in which it orbits the Earth." Bai Yang was quite proud. Being praised by a beautiful girl was much more rewarding than being praised by a bald physics teacher. He wrote down the formula on a piece of scratch paper and continued calculating in one go. "Adding the Earth's radius, r should be 137,610 kilometers. G is the gravitational constant. We take 6.67×10^(-11)Nm/kg... The formula is T=√(4πr/GM), so T should be..."
Bai Yang held the microphone in his hand, counting and muttering to himself. The room was silent late at night, and only the girl twenty years later was listening attentively.
Numbers and formulas flowed from the boy's pen, forming a small river on the white paper.
Bai Yang lived for eighteen years and studied physics for five years. For the first time, his dragon-slaying skills, which allowed him to catch the moon in the sky and turtles in the oceans, came in practical use.
When he really used it, Bai Yang was surprised to find that he had mastered such a powerful tool. This is the law of the operation of the universe and the underlying code of Universe Online. Every high school student has built a magnificent building of classical physics in his mind, but few people really use it, leaving it to weather and collapse in time.
"16 days!"
"Miss, the black moon's orbital cycle is 16 days. It revolves around the earth once every 16 days. OVER."
"Incredible! This is amazing, BG4MXH, how did you do this?"
Banxia couldn't believe it, she felt like BG4MXH was performing magic.
He had never seen the black moon, so how could he know how long it took for the black moon to complete a rotation?
"I didn't do it by myself. Behind me stood Newton, Kepler and all the physicists in human history," Bai Yang said. "And my physics teacher taught me the most advanced wisdom contained in all the most talented minds in history."
"Then your physics teacher is amazing!"
"I want to thank you on behalf of our physics teacher, Miss. Your teacher must have figured out all these things at the time." Bai Yang said, "Let's continue to work it out. Now we know that the black moon is 130,000 kilometers away from us, but I don't understand why it orbits 130,000 kilometers away from the earth?"
Banxia was stunned. She didn't know what this question meant.
Why does it orbit 130,000 kilometers away from the earth?
Black Moon wants to stay in that place, so that's its freedom, right?
How could she possibly know why?
"Miss, the big eyeball came from the black moon, right? Then why doesn't the black moon come closer to facilitate the big eyeball's arrival?" Bai Yang asked a question that Ban Xia had never thought of. "130,000 kilometers, this distance is not close. It will take a long time to fly. Why doesn't it come closer? OVER."
"Hmm... maybe there's some special reason?"
The girl thought about it.
"There is a reason behind any phenomenon." Bai Yang said, "Miss, let's imagine it this way. The reason why it can't get any closer is because it can't get any closer. The reason why it has to stay in an orbit 130,000 kilometers away is because it can only stay in an orbit 130,000 kilometers away at the nearest distance. OVER."
"Why?" Banxia asked, "Why can it only stay there?"
"Because there is a force restricting it." Bai Yang replied, "There is a force that no one can resist, OVER."
"What power?"
"Gravity, Miss, is universal gravitation." Bai Yang said, "It is the only uncontrolled force in the universe. It is restricting Black Moon. If Black Moon gets too close, it will be torn into pieces by the earth's huge gravity. 130,000 kilometers is its safe range. It cannot cross this red line. Those who cross the line will be crushed to pieces... The name of this red line is the Roche limit, OVER."
"Assuming that 130,000 kilometers is the Roche limit of the Earth and the Black Moon, then we can work our way back to the density of the Black Moon... Let me find the formula for the Roche limit! There are fluid Roche limits and rigid body Roche limits..." Bai Yang opened his phone and hurriedly searched Baidu, pulling out a blank piece of draft paper, "I found it! I found it! Let me calculate, the formula is d=2.423R(ρ/ρ)^(1/3), the average density of the Earth is 5507.85kg/m... Then the average density of the Black Moon under the fluid Roche limit is 7.83kg/m, and the average density under the rigid body Roche limit is 1.09kg/m."
"Miss, the average density of the Black Moon is between 1.09kg/m3 and 7.83kg/m3."
Banxia was a little dazed and didn't understand what this number meant.
What is the concept of density?
The density of the air we breathe in our daily lives is 1.3kg/m3. The density of nitrogen is 1.26kg/m3, the density of oxygen is 1.46kg/m3, and the density of radon, the gas with the highest density, is 9.73kg/m3. This means that the maximum density of the Black Moon is not as high as that of radon.
"What does this mean?" Banxia asked.
"This means that either the Black Moon is a gaseous satellite, it is actually a ball of gas." Bai Yang paused, "or there is a huge cavity inside it, it is hollow."
(End of this chapter)
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