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

Determining that the source of the signal is Titan's orbit, various types of telescopes are aimed at Titan's position and tracking it.

To be exact, it was Titan's position more than an hour ago.

After all, it would take so long for the light to come from there.

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

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

"Patriarch, this one is in a hurry. Gu Song relieved a leader next to him, "To observe such a distant star, the telescope itself needs to make complex and accurate precision settings. What's more, in order to avoid signal distortion, the amount of redundancy is very large, and the transmission rate is limited. At this point, it can only be concluded that the source of the signal is not an alien mothership of the size of a planet, so we can't observe it with ordinary telescopes, which is good news. ”

Tang Yuanfeng glanced at him helplessly: "This is good news?"

"Good news, of course...... What if an astronomer could scan a telescope and see a huge pestle there, and then the pictures would be all over the place? ”

Tang Yuanfeng shuddered a little.

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

"Hopefully, there will be results from this round of observations. ”

"I ...... Not very optimistic. ”

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

"It's just too far away. The Sky Survey and Hubble have about the same optical resolution, and FAST is a radio telescope, which operates in different wavelength bands. And this signal source, if the size is small, the observation equipment on the surface and in the earth's orbit cannot be photographed. If the Sky Survey and Hubble take pictures of Mars, ideally, the resolution of the photos they take will be more than ten kilometers. As long as this thing is smaller than a dozen kilometers, it won't even occupy a single pixel. Let alone...... This signal 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 is much farther away. More than a billion kilometers away...... I'm really not optimistic that these telescopes will be able to capture it. ”

After saying that, there was some silence in the carriage.

If it does, 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 shoot it, you don't know the bottom of your heart.

Tang Yuanfeng opened his mouth and asked, "In other words, if you want to photograph it, you need to send the observation equipment to the vicinity of Saturn?"

"Even if there is a finished product to launch right now, when it reaches Saturn, it will be the year of the monkey. But now near Saturn, there is actually a probe. ”

The chief engineer of the Huaguo Space Development Committee next to him immediately added: "Cassini, it entered the orbit of Saturn in 04. Now ten years later, I've heard that there is one last mission that will run out of fuel. ”

Tang Yuanfeng thought and said, "In other words, they are the first to obtain the images and data of this signal source as the most likely now?"

Gu Song nodded: "If the Sky Survey can be photographed, Hubble can also be photographed, and the effect should be a little better." If the Sky Survey can't be photographed, then only Cassini can. Of course, it is only possible, and it is not known where Cassini's current orbit is, and whether Cassini can capture Titan with the camera he carries. They don't have this data publicly available to us right now. ”

……

Behind Lydins, there stood a large number of big people.

"Come on, Cassini, we must take the initiative. ”

The location of the signal source was not difficult, and when the information that it was located in the orbit of Titan was determined, everyone from Tang Commander to a group of insiders fell into some inexplicable joy.

God bless Ami, the first negotiation between humans and an extraterrestrial advanced civilization, will be the greatest opportunity Ami has.

It all seems to have been calculated!

Titan, right in front of Cassini's orbit. At his current orbital position, Cassini has twenty-three days to pass over the surface of Titan.

At that time, it will be only 474 kilometers away from the satellite.

How could there be such a coincidence in the universe?

The signal source appeared in Titan, and at this time it sent a signal to the Earth, which must have been to remind the earthlings. It may even have seen Cassini, calculated something from it, and deduced that the earthlings had the ability to discover her, so it sent the signal.

It has been emitting signals for such a long time, is there an intention to let the earthlings calculate its orbit through the changing position of the signal source?

In the vast universe, it is moving at high speed, which is like a game of peek-a-boo.

No!

This is a result that NASA scientists excitedly guessed.

Whether Cassini can photograph it or not may affect the subsequent development!

It's a pity that Cassini is just a detector. The device it carries has no way to accomplish more complex communication behaviors.

Now the situation is more complicated, and the fuel it carries is also close to running out. It was sweeping towards Titan at high speed, and the remaining fuel, not even enough to allow it to slow down accurately, was captured by Titan, and also entered Titan's orbit.

Commander Tang is a little difficult to understand these nerds, now figuring out what is on the other side is the most important thing! What exam questions are not examined, is this a game?

He could only suppress such thoughts first and encourage these people to do their jobs first.

Hubble's data has come back, and nothing can be seen but Cassini!

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

Wake up first and take a pat at at it.

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

Now, Cassini has woken up and spent precious fuel on a posture adjustment.

With one purpose in mind, it aimed its imaging instruments at Titan.

According to the previously calculated orbital data of the signal source, according to the speed at which it moves, according to the direction and speed of movement of Cassini, a very complex calculation is formed, and only then is an instruction formed.

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

It took more than an hour for the order to be transmitted.

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

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

The data it captured, after more than an hour of traveling, should be starting to be received

"It's coming, it's coming!"

Commander Tang was also a little excited, and rushed forward to take a sneak peek.

It was so boring that I tossed back and forth for hours before I could finish taking a picture.

Hopefully the results don't disappoint him.

Looking at the data on the computer in front of him, Commander Tang asked suspiciously, "What about the photos?"

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

"Hundreds of bits?"

"Yes sir, less than 1KB per second, so, we need to be patient for a while. ”

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

"There are more than 500 GB!

No one knew more about mathematics than Commander Tang, and he began to convert it in his head. 1GB equals 1024MB, and 1MB equals 1024KB. Less than 1KB in one second, 60 seconds in 1 minute, 60 minutes in 1 hour, 24 hours a day, 365 days a year...... Oh no, there are also 366 days, so how long does it take for more than 500 GB to accumulate and pass over?

Commander Tang decided not to dwell on this issue, he could only sit there and wait for this set of photo data to come back.

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

Commander Tang looked at the processed photos in his hand, and involuntarily showed the old man's face as he looked at the question mark on his mobile phone.

？？？

"At the very least, we can at least be sure that the source is not a giant being...... But now, Cassini is still too far away, and we are looking pixel by pixel for possibility. If it's better than a pixel, we'll have to wait until Cassini is a little closer to Titan before shooting. ”

"How long?"

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

"Then shoot as fast as you can. ”

"Saturn is a planetary system with more than 200 moons, of which only 60 have clear orbits, so its gravitational perturbation environment is complex. Cassini is in the Saturn system, and he must use fuel for a long time to maintain a specific orbit. I think, to be on the safe side, this might not be the best idea. Cassini...... There is very little fuel left. ”

He also knew that the situation was special, adding: "Cassini's original plans have all been cancelled, and we are doing our best to calculate and try to see if there is a chance that it will enter the orbit of Titan." Of course, this is almost unlikely, and our ideal outcome would be to abandon all remaining plans and use the remaining fuel to make a few weak orbit changes to give it the best possible observation window. ”

After all, according to its original orbit, it is also nearly 500 kilometers above the surface of Saturn. If the source is a detector the size of Cassini, we have to be close enough to have a chance to photograph it. So the safest way to do this is to save the most precious observation opportunity until it reaches the vicinity of Titan. ”

Commander Tang didn't expect it to be so complicated, he confirmed, "So, we still have to wait until 23 days later?"

"Maybe more than 23 days because we want to try to slow down and change tracks. Specific data ...... It needs to be determined after calculation. ”

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

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

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

"No, no, no, lead the students! If it's some kind of exam question, of course, the clues are one after another. Since its encounter with Cassini was not accidental, the most crucial clue must be on Cassini! The initiative is already in our hands!"

Commander Tang liked this judgment, and the uncle's face disappeared when he looked at the question mark on his phone, and his face was full of confidence.

No one knows Cassini better than I do!