When the third child was scaring the children, the eldest was holding a small red flag in his hand.

"Ahem! Good evening ladies and gentlemen, this time we are responsible for picking you up, and please keep order after you get on the boat for a while, line up and follow my little red flag, if the small flag does not fall, you are not allowed to run around, and if you lose one, I will be deducted from my salary! Thank you for your cooperation......"

The familiar opening remarks of the tour guide made the corners of everyone's mouths twitch, look at the people present, in addition to seven or eight hands and feet, it is more convenient to be able to move on their own, and the rest are either in a wheelchair or lying on a stretcher, you should run one and I will take a look!

"Hey! Lao Liang, these two people who came to pick us up don't look very reliable...... What SOS organization is really okay with this? An old man with gray hair and a wrinkled face said to the rosacea-nosed man in a wheelchair next to him.

"Lao Yu has confirmed it, there should be no problem! Besides, with our old bones that are about to go to the ground, what can people want from us? As far as the technology in our heads is concerned, maybe people really don't like it. ”

Before leaving, these scientists were informed in advance of some information about Captain Ghost and the SOS organization, and no one could not help but say a word about Captain Ghost's black technology, and the style of painting was too different from this era!

"Well, when you see the old man in a while, you can know whether this is true or not......"

"Oh! Here it comes! At this moment, the boss suddenly turned his head and said.

"Whoa~" Under the moonlight, it was like a silver giant whale slowly surfacing from the water, and everyone's eyes slowly widened......

……

Earth's secret base.

"Lagrange point?!" Nie Yun looked at the excited Yu Lao in front of him and wondered.

Information about the Lagrange point immediately came to his mind.

A Lagrangian point refers to a special location in space where the gravitational and centrifugal forces of two celestial bodies are balanced so that the third object remains relatively stationary with the first two.

For example, if a satellite is placed at the Lagrange point of the solar-terrestrial system, the satellite can remain relatively stationary with the Sun and the Earth, and can carry out observation activities on both in a stable manner.

This characteristic of the Lagrange point makes it of considerable strategic value in the space age!

Because it requires little or no fuel to maintain orbital stability, and in the space age, it has the best conditions to become a transportation hub due to its low operating costs!

This is like Shanghai's natural strategic location, which is destined to become an important transportation hub in global trade!

"I hadn't thought about this before, and indeed, this feature is too good for placing monitors!"

Although Nie Yun has a large amount of astronomical data in his mind, he is not a professional astronomer after all, and there are still blind spots in his thinking!

His mind immediately began to rapidly analyze the possibility of an alien probe at the Lagrange point......

There are a total of 5 Lagrangian points around large celestial bodies such as planets or stars, and these 5 Lagrangian points are L1~L5 in the solar-terrestrial system.

Among them, L1~L3 is on the line between the two celestial bodies.

The first Lagrangian point, L1, is located between the Earth and the Sun, about a million miles from the Earth.

The Sun can be observed on L1 without gravitational interference. The site is now occupied by the Solar and Solar Wind Layer Probe (SOHO) and the Deep Space Meteorological Satellite.

L2 is also located about 1 million miles from Earth, but unlike L1, it is not between the Sun and the Earth, but on the extension of the Sun and the Earth.

With the Sun, Earth, and Moon behind it, the spacecraft in this position can clearly observe Mars and even the entire deep space.

NASA's Wilkinson Microwave Anisotropy Probe (MAP) is currently at point L2 to measure the thermal radiation that remains after the Big Bang.

These two Lagrange points have been occupied by the above-mentioned probes from Europa and NASA, and these probes are very close to the earth, and they have been renamed Nie by the way in the "Solar System Reconnaissance Network" program not long ago, and it is unlikely that the alien probes will be able to engage in espionage activities under Nie Yun's nose, which can basically be ruled out.

The third Lagrange point L3 is located on the Earth-Sun extension line opposite to the direction of the Earth, and it is separated from the Earth by the Sun.

Then, there are only two points left: L4 and L5!

They are located on opposite sides of the Earth and are the two intersections of the vertical bisector of the Sun-Earth line and the Earth's orbit.

And these two points are one of Nie Yun's current detection blind spots!

"Hmmm! From the point of view of celestial kinematics, this is the best position where the probe may exist! I prefer L4 and L5! Yu Lao said a judgment similar to Nie Yun's.

"Hmm...... However, considering that the other party's technology may be far superior to that of the earth, the possibility of other locations cannot be ruled out......

And if you want to be very hidden, this is likely to be a passive detector, with the fixed target of the earth, the reconnaissance of passive detection is actually enough!

It is also very likely that the appearance camouflage, or even optical stealth processing!

In addition, since it cannot be detected by the existing detection technology on the earth, the other party's means of communication should not be traditional radio technology, perhaps laser communication, which is extremely difficult to detect and has excellent secrecy, or more advanced quantum communication, or even a means of communication beyond my understanding......"

Yu Lao said as he observed Nie Yun's expression.

He used "the other party" many times in his words just now, but Nie Yun didn't say anything about it, obviously acquiescing to the existence of the "other party", and he couldn't help but be more sure of his previous judgment in his heart.

Sure enough, it's not to find a place for yourself to put the detector! The boss's opponent...... Suddenly so excited......

How could Nie Yun not find out Yu Lao's careful thoughts, but sooner or later he had to let them know, and he didn't tell them directly because even he knew very little about this group of B stars, and even whether the probe existed or not was a question.

If you make an oolong by then, you will be very faceless as the boss!

Could it be that he said: "Oh, I made a mistake, it turned out that I was scared of myself, so embarrassing......"

In this case, the tall SOS organization will fall to the bottom, okay?

"Hmmm! You've done a good job, I'll send a probe to visit these two locations, and whatever the outcome, as a reward, all of the Seawolf's detection data will be open to you! Nie Yun smiled.

Yu Lao instantly became excited, this kind of space observation data is the most precious thing for an astrophysicist like him!

However, he will soon discover that the Seawolf's detection data is not only in Earth orbit......

"By the way, your colleagues are almost there, as their head and old acquaintance, go and say hello to them before this, it will also make them feel more at ease.

In addition, I will arrange the genetic reflux surgery as soon as possible, and you will also be ready to prepare. Nie Yun glanced at Yu Lao meaningfully.

"Hey, hey! Don't worry, boss, leave it to me! Yu Lao smiled......