Rebirth: Fight For Life

   Chapter 771 No one knows Cassini better than me

   At this point in time, it can only be said that everything is running at high speed.

   It was determined that the source of the signal was the orbit of Titan, and various types of telescopes were aimed at the position of Titan and tracked it.

   To be precise, it was the position of Titan more than an hour ago.

   After all, it takes so long for the light to pass from there.

   At the same time, Gu Song and Tang Yuanfeng had already boarded the high-speed train to Xinghai City.

In the carriage, Tang Yuanfeng asked, "Can't the observation data from the telescope be processed yet?"

"Veteran, this can't be rushed." Gu Song relieved a leader next to him. "To observe such a distant star, the telescope itself needs to do complicated and accurate precision settings. Besides, in order to avoid signal distortion, there is a lot of redundancy. , the transmission rate is limited. Now it can only be preliminarily determined that the signal source is not an alien mothership that is large enough to rival a planet, so we cannot observe it with ordinary telescopes, which is good news.”

  Tang Yuanfeng glanced at him helplessly: "Is this good news?"

   "Of course it's good news... If astronomers take a swipe with a telescope, they can see a behemoth there, and the photos will spread all over the sky, what will happen? Think about it."

  Tang Yuanfeng shuddered a little.

   That really has to use the highest level of means to see if we can maintain order and not collapse.

   "Hopefully this round of observations will yield results."

   "I...not very optimistic."

  Tang Yuanfeng looked at him solemnly and asked, "How do you say?"

"The distance is just too far. The Sky Survey and Hubble have about the same optical resolution, and FAST is a radio telescope, and it works in different wavelengths. And this signal source, if it's small in size, the surface and orbiting observation equipment, is It is impossible to take pictures. If the Sky Survey and Hubble take pictures of Mars, ideally, the resolution of the pictures taken will be more than ten kilometers. As long as the object is smaller than ten kilometers, it will occupy even one pixel. No. Besides...the source is near Saturn."

"Earth used to be Mars, Mars used to be Jupiter, and Jupiter used to be Saturn. From Mars onwards, the distance between planets and planets is much farther. More than a billion kilometers away... I really don't think these telescopes can take pictures. arrive."

After    finished speaking, there was some silence in the carriage.

  If it is photographed, it means that the source of the signal will be a behemoth the size of a planet, and the pressure is suffocating.

  If you can't take pictures, you will also have no bottom in your heart.

  Tang Yuanfeng asked: "That is to say, if you want to photograph it, you need to send observation equipment to the vicinity of Saturn?"

   "Even if there is a finished product that can be launched immediately, when it reaches Saturn, it will have to be the Year of the Monkey. But there is actually a probe near Saturn now."

   The chief engineer of the Huaguo Space Development Committee immediately added: "Cassini, it entered Saturn's orbit in 2004. Now ten years have passed, and I heard that the last mission will run out of fuel."

  Tang Yuanfeng thought about it and said, "That is to say, who are the ones who are most likely to get the images and data of this signal source first?"

Gu Song nodded: "If the Sky Survey can take pictures, Hubble can also take pictures, and the effect should be better. If the Sky Survey can't take pictures, only Cassini can take pictures. Of course, it's only possible. , I don't know where the current orbit of Cassini is, and whether the camera carried by Cassini can photograph Titan. They have not disclosed these data to us now."

  …

  Behind Ladings, a large crowd of bigwigs stood.

   "Come on, Cassini! We must let us take the initiative."

   The location of the signal source is not difficult. When the information about its location in the orbit of Titan was confirmed, from Commander Tang to a group of insiders, all fell into some inexplicable joy.

  God bless Ami, the first negotiation between mankind and an advanced alien civilization will be the greatest opportunity for Ami.

   All this seems to be calculated!

  Titan, just in front of Cassini's orbit. According to the current orbital position, Cassini will pass over the surface of Titan in twenty-three days.

   By then, it will be only 474 kilometers away from this satellite.

How could there be such a coincidence in the    universe?

  The signal source appeared on Titan, and at this time, it sent a signal to the earth, which must be to remind people on earth. It may even have seen Cassini, calculated something from it, deduced that Earthlings have the ability to find her, and sent the signal.

   It has continuously launched signals for such a long time. Is there a purpose in it, so that people on earth can calculate its orbit through the constantly changing position of the signal source?

  In the vast universe, it is moving at high speed, which is like a hide-and-seek game.

Do not! It's an exam question!

   This is a result of excited speculation by NASA scientists.

  Whether Cassini can photograph it may affect the follow-up development!

   Unfortunately, Cassini is just a detector. The equipment it carries has no way to complete more complex communication behaviors.

   The situation is more complicated now, and the fuel it carries is almost exhausted. It is swept toward Titan at high speed, and the remaining fuel is not even enough to ensure that it slows down precisely, is captured by Titan, and also enters the orbit of Titan.

   Commander Tang is a little hard to understand these idiots, and now it is most important to figure out what is on the other side! What exam questions are not exam questions, is this a game?

He can only suppress the idea of ​​   and encourage these people to do the work first.

  The Hubble data has been sent back, nothing can be seen, only Cassini!

   After some debate, it was Commander Tang who made the decision.

   Wake up first, take a pat and see.

   Just kidding, where can you afford to wait 23 days?

   Now, Cassini has been awakened, expending precious fuel to make a stance adjustment.

   has only one purpose, aiming its imaging instrument at Titan.

  According to the previously calculated signal source track data, according to its moving speed, according to Cassini's moving direction and moving speed, an instruction is formed after a very complicated calculation.

   Cassini will take a shot at a specified time point with the specified shooting parameter settings.

The    command was sent and it took more than an hour.

   Then, it starts to get ready for shooting, waiting for the shooting time to come.

   So at the moment, in the control center, everyone is cheering. Because according to the time, it should have been filmed.

   The data it shoots, after more than an hour of running around again, should start to be received

"I'm coming!"

   Commander Tang was also a little excited and rushed forward to get a first glimpse.

  It was so boring, it took several hours of tossing back and forth to complete a photo.

   Hope the result doesn't disappoint him.

   Looking at the data on the computer in front of him, Commander Tang asked suspiciously, "Where's the photo?"

The young technician said: "Union leader, she is more than one billion kilometers away from us. In order to ensure that the signal transmission over such a long distance will not be lost or lost, the redundancy of communication is very large. Moreover, with such a long distance, every In one second, we can only receive hundreds of bits of data."

   "Hundreds of bits?"

   "Yes sir, it's less than 1KB per second, so we need to wait patiently for a while."

   Commander Tang was a little lost and couldn't help asking: "How much data has Cassini passed back?"

   "There are more than 500 GB! They are all very precious materials, so they will lead students!"

   No one understands mathematics better than Commander Tang, and he began to convert in his mind. 1GB is equal to 1024MB, and 1MB is equal to 1024KB. Less than 1KB per second, 1 minute 60 seconds, 1 hour 60 minutes, 24 hours a day, 365 days a year... Oh no, there are also 366 days, so how long does it take to transfer more than 500 GB?

   Commander Tang decided not to worry about this issue. He could only sit there and wait for this set of photo data to come back.

After the    was sent back, it took a long time to deal with it.

   Commander Tang looked at the processed photo and involuntarily showed the old man's face looking at the question mark on his phone.

  ? ? ?

"Leading up the students, we can at least be sure that the source is not a giant being... But right now, Cassini is too far away, and we're looking pixel by pixel for the possibility of its existence. If it's bigger than a pixel Well, we'll have to wait until Cassini is a little closer to Titan."

"how long?"

   "This... we don't know either, because we don't know how big the signal source is, how close the camera on Cassini has to go to capture it."

   "Then shoot as fast and as often as possible."

"Union," said the head of the Cassini project, with sweat on his forehead, "Saturn is a planetary system with more than 200 moons, of which only 60 have definite orbits, so its gravitational perturbation environment is complex. Cassey Nei is in the Saturn system and has to use fuel for a long time to maintain a certain orbit. I think, to be on the safe side, this may not be the best idea. Cassini... There is very little fuel left."

He also knew that the situation was special, and added: "Cassini's original plans have all been cancelled, and we are doing our best to calculate and try to see if it has the possibility of entering the orbit of Titan. Of course, there is almost no such possibility, Our ideal outcome would be to abandon all remaining plans and use the remaining fuel to make a few weak orbital changes to give it the best possible observation window."

"After all, according to its original orbit, it is also nearly 500 kilometers away from the surface of Saturn. If the information source is a Cassini-sized detector, then we must be close enough to have a chance to photograph it clearly. So the safest The way is to save the most valuable observation opportunities until it reaches the vicinity of Titan."

   Commander Tang did not expect it to be so complicated, he confirmed: "So, we have to wait until 23 days later?"

   "Maybe more than 23 days, because we want to try to decelerate. The specific data...need to be determined after calculation."

   Commander Tang sighed helplessly: "It's really difficult."

This group of NASA scientists took it for granted: "Of course, otherwise how can it be called an exam question. The state of Cassini is so difficult, and it is part of the exam itself. But I think this question is currently only us. Only have the ability to answer!"

   "What about the decryption of the signal? They have a quantum supercomputing center, what if they complete the decryption of the signal first?"

"No, no, lead students! If it is some kind of exam question, the clues are of course one after another. Since its encounter with Cassini is not accidental, then the most crucial clue must be on Cassini! So, Don't worry about this at all. The initiative is already in our hands!"

   Commander Tang liked this judgment. The question mark face disappeared when the uncle looked at the phone, and his face was full of confident expressions.

  No one knows Cassini better than me!

   (end of this chapter)