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Text Chapter 42 It is 130,000 kilometers away

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    As soon as Wang Ning finished speaking, the 725 amateur radio station on the coffee table began to radiate electromagnetic signals to the outside. It converted pictures into sounds, and then hid the sounds in radio waves that human ears cannot capture. This is a whisper that humans cannot capture and understand.  Whisper, but the amazing thing is that it is actually an image¡ªit may be unimaginable for ordinary people to convert an image into sound, but for people who have mastered information coding technology, information is information, and the carrier is the carrier.  As long as you have an insight into the essence of information, it is not difficult to separate it from the carrier¡ªsince humans carved murals in caves with chisels hundreds of thousands of years ago, images are the carrier of visual information, and it has developed from rock walls to mud.  On the board, on the canvas, on the straw paper, and on the photosensitive film, after thousands of years of vicissitudes, the relationship between the two seems to have remained unchanged until the fire of the industrial revolution ignited, and information theory brought about innovations in the world. People can finally convert image information from  Grab it from the two-dimensional plane, stuff it into the sound, stuff it into the current, stuff it into the light wave, from then on any information can be broken apart and shredded into any carrier.

    Insight into the essence of information, in a sense, this is also the power of God.

    Grasping the information, human beings have taken another step in the direction of the gods.

    Bai Zhen is standing in front of the laptop screen, and the photos are being scanned from top to bottom bit by bit, what does this feel like?  Like a lottery, scratch music, scraping off one by one, revealing the pictures behind.

    At the beginning, the signal reception was not good, and only green snowflake noise was scraped out. Bai Zhen adjusted the direction of the antenna slightly, so that he could receive clearer photos.

    "How is the situation?" Wang Ning asked.

    "It's okay." Bai Zhen replied, "It's just that the speed is a bit slow."

    A Ugandan chimpanzee Bah, a half-length photo of a baboon is 15kb in size, and the transmission speed between the 725 and 705 in the simulation experiment in the living room at the moment is only about 1000bps, which is 0.1kb per second. Ideally, put this  It takes 150 seconds, or two and a half minutes, for a photo to be completely transmitted successfully.

    But how can the truth be so ideal?

    After all, radio is radio, not cable fiber optics. It is convenient and simple to use radio waves to transmit signals, but you can no longer expect it to be very efficient.

    Of the three of convenience, simplicity and efficiency, you can only have two at the same time.

    Therefore, the image transmitted by amateur radio is unstable. When it comes to network engineering, the packet loss is serious. If the antenna is not aligned properly, what is scraped out is a strip of green snowflake spots. If you want to successfully receive a complete and clear picture at one time, it is  Impossible.

    In order to ensure that the signal can be completely transmitted, Wang Ning will send multiple redundant signals at this end. His 725 will send pictures continuously in 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 was scratching repeatedly, and being able to scratch out a complete photo of himself was considered a big prize.

    "Wait there is interference, where is the interference?" Bai Zhen scratched his head and looked around, "Is it a switch? Wait a minute, old Wang, I'll try to pull the brake."

    He immediately ran to turn off the electric switch, and the power was cut off, and the room was suddenly dark.

    "Is there a power outage?" My mother came out of the bedroom holding her mobile phone and flashlight, "Why is it suddenly dark?"

    "Lao Bai has switched on." Wang Ning sat on the sofa, his fat face illuminated by the dark green light of the crt monitor, "We are doing an image transmission experiment."

    "You do the experiment as soon as you do the experiment, what gate do you pull?" Mom asked.

    "There is interference." Wang Ning replied.

    Annoying electromagnetic interference is everywhere in modern society, such as the tower crane at the construction site next door, the security intercom at the gate of the community, the electric car downstairs, and many inconspicuous small appliances in daily life, such as the power switch in the house, it is everywhere  , All-round stereo interference, there is no way to avoid it, Bai Zhen can only turn off the switch in his own house, not in the neighbor's house, let alone in the Meihuashanzhuang community, the electromagnetic environment in the city is just that bad.

    Some old hams like field battles Ah no, wild frames, they are fighting in this clean and endless environment. The good signal-to-noise ratio allows them to hear the sound of flies rubbing their hands on the radio wave.

    After the power was cut off, Bai Zhen tried to receive the signal again.

    "Is there anything better?" Wang Ning asked.

    "No!" Bai Zhen said, "What a dick."

    "Go and find the main gate of the community." Wang Ning said, "Turn off all the electricity in the community, so that the interference will be fine."

    "Then I won't be eaten alive by the property management?"

    "Hey, for special reasons and special times, I told them to urgently requisition electricity. The first machine used positron cannons on Zijin Mountain to deal with the second?After living for eighteen years and studying physics for five years, those dragon-slaying skills that can capture the moon in the sky and catch turtles in the ocean for the first time have come into practical use for the first time.

    After actually using it, Bai Yang realized that he had mastered such a powerful tool. This is the law of the universe, the underlying code of the universe online. Every high school student has built a magnificent building of classical physics in his mind, but few  Someone really used it and let it weather and collapse in time.

    "16 days!"

    "Miss, the cycle of the black moon is 16 days, it revolves around the earth every 16 days, over."

    "Unbelievable! Amazing, bg4mxh, how did this work?"

    Ban Xia couldn't believe it, she felt that bg4mxh was doing magic.

    He has never seen a black moon, why can he know how long it takes for the black moon to turn around?

    "I didn't do it by myself. Behind me are Newton, Kepler and all the physicists in human history." Bai Yang said, "And my physics teacher, he put all the most genius minds in history  It taught me all the top wisdom contained therein.¡±

    "Then your physics teacher is amazing!"

    "On behalf of our physics teacher, thank you, miss, your teacher must have calculated all these things at the time." Bai Yang said, "Let's continue to push down, now we know that Black Moon is 130,000 kilometers away from us, but  I can't understand why it is orbiting at a distance of 130,000 kilometers from the earth?"

    Ban Xia was stunned, she didn't know what this question meant.

    Why is it orbiting at a distance of 130,000 kilometers from the earth?

    Black Moon is willing to stay in that place, is that its freedom?

    How could she know why?

    "Miss, the big eyes come from the black moon, right? Then why doesn't the black moon come closer so that the big eyes can come down?" Bai Yang asked a question that Ban Xia had never thought about before, "130,000 kilometers, how long is it?"  The distance is not close, it takes a long time to fly, why doesn¡¯t it get closer? over.¡±

    "Hmm maybe there is some special reason?"

    The girl thought about it.

    "There is a reason behind every phenomenon." Bai Yang said, "Miss, let's imagine it this way. The reason why it can't get closer is because it can't get any closer. The reason why it wants to stay in orbit 130,000 kilometers away is  It¡¯s because it can only stay in an orbit of 130,000 kilometers recently, over.¡±

    "Why?" Ban Xia asked, "Why can it only stay there?"

    "Because there is a force restricting it." Bai Yang replied, "There is an irresistible force restricting it, over."

    "What power?"

    "Gravity, miss, is universal gravitation." Bai Yang said, "the only force in this universe that cannot be unified and cannot be controlled. It is restricting the black moon. If the black moon gets too close, it will be torn to pieces by the huge gravity of the earth."  130,000 kilometers is its safe range, it cannot cross this red line, and those who cross the threshold 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 deduce the density of the black moonLet me find the formula for the Roche limit! There are fluid Roche limit and rigid body Roche limit  "Bai Yang turned on his phone and frantically searched Baidu, and took out a blank draft paper, "I found it! I found it! Let me do the math, the formula is d=4.423r(p??/p??)^(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 Roche limit is 1.09kg/m??.  "

    "Miss, the average density of the black moon is between 1.09kg/m?? and 7.83kg/m??."

    Ban Xia was a little dazed, not understanding what the numbers meant.

    What is the concept of this density?

    The density of the air we breathe in our daily life is 1.3kg/m??.  The density of nitrogen is 1.26kg/m??, the density of oxygen is 1.46kg/m??, and the gas with the highest density, radon, is 9.73kg/m??  .

    "What does this mean?" Ban Xia asked.

    "This means that either Black Moon is a gaseous satellite, and it's actually a mass of gas." Bai Yang paused, "Either it has a huge cavity inside, and it's hollow." Genius remembered the address of this site in a second  ?
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