Next, the two civilizations fall into a strange equilibrium.

After the Green Light civilization stationed at Sedna Star, it began to collect resources on a large scale and repair the spacecraft.With more than one thing, they don’t want to have too much communication with this seemingly more powerful “new human civilization.”

They don’t know if communicating with each other.In order to reduce unnecessary trouble, they even hid behind the star Sedna and let a planet block itself.

Similarly, the human Noah has been floating in the Martian atmosphere, drifting with Mars.Humans also do not want to have too much communication with the green light civilization.

But if you want Noah to land on Mars, you must overcome the air buoyancy, that is, to load a large number of heavy objects outside Noah.This landing method is so strange that it may be seen by the green civilization.

In order to be cautious, Yu Yifeng never issued a landing order.But humans are not very eager to collect resources, because those low-end robots are more likely to cause humans to be exposed.

Fortunately, after so long mining, Noah's material reserves have been extremely rich, even if there is no external material supplement, people can start work normally.

Now the most urgent thing for mankind is to make more powerful means of observation!This is also a project that Yi Feng focuses on.

The difference between the two civilizations is eighty-five astronomical units, which is not worth mentioning the distance of the universe, but it is still too far for humans.

With the current observation ability of people's astronomical telescopes, the other side's spacecraft is only a very small point, and it is difficult to see the specific situation clearly.

The sun's light has reached the position of Sedna, which is already very weak, the reflection of light on the planet is almost no, and it is difficult for ordinary telescopes to see.And the green civilization alien spacecraft hiding behind the planet, it is more difficult to observe.Humans can only estimate the specific location of the other spacecraft through the leakage of the other party's infrared light.

But since the alien spacecraft stationed on the star Sedna, perhaps because a large number of engines have been shut down, the leakage of infrared light is so small that humans often lose the vision of the alien spacecraft.

This made Yi Feng very angry, and he would never allow this unknown situation to appear.So he is urging scientists and engineers to build more powerful observation facilities.

The first method: a more powerful radio interferometer.This radio interferometer is not a traditional single-antenna radio telescope, but consists of two different telescopes.

For radio interferometers, the greater the maximum spacing between the two antennas, the higher the resolution.In addition, when the diameter of the antenna or the spacing of the two-day line is certain, the shorter the radio wavelength received, the higher the resolution.

The radio interferometer is undoubtedly clearer than a simple radio telescope, and it has a higher sensitivity.

According to the scientists' calculations, two radio telescopes with a diameter of 200 meters are distributed at both ends of the Noah, and then constitute radio interferometers through a series of scientific and technological means, with a maximum resolution of 10,000th of an angle.

"Noah is still too small, if only it were hundreds of kilometers."

Yu Yifeng can't help thinking.Because of the folding space, the volume inside is not small, but the outer surface area is small, and there is no way to accommodate larger telescopes.More because of the restrictions on the entrance and exit, Noah is very unable to enter and exit very large machinery, which is actually a major limitation of this spacecraft.

After the development of science and technology, human beings must take Noah as the core and build more large spacecraft, like a green light civilization with a diameter of hundreds of kilometers.

The idea is that Yi Feng's mind is just a flash away, and it can't be done with current technology.He sighed, and everything had to be down to earth.He believes that according to the current speed of scientific and technological explosion, it will not be too far away from that day.

In addition to the radio interferometer, there is another scheme, that is, the gravitational wave telescope!

Gravitational waves were proposed and predicted by Einstein, the greatest scientist of the 20th century.In physics, gravitational waves are ripples in the bending of space-time, which travel outward from the radiation source through the form of waves and transmit energy.

In 2015, scientists actually observed the existence of gravitational waves in the collision of dual black hole systems and opened the era of gravitational wave astronomy.This finding is another proof of Einstein’s general theory of relativity.

Gravitational waves have a very important and unique property: they can pass through objects almost unstoppable.For example, light from distant stars is obscured by the interstellar medium, but gravitational waves can pass through without hindrance.This feature allows gravitational waves to carry more information on astronomical phenomena that have never been observed before.

The gravitational wave telescope is an instrument for observing gravitational waves.

“The gravitational wave is too weak, and the fluctuations it brings are very small, requiring instruments with a very high precision.So far, we have not been able to directly “see” gravitational waves, which can only be detected by gravitational lensing or a slight oscillation of elastic objects.”

In this meeting, Yi Feng and a group of engineers, as well as a large number of astronomical scientists, are discussing this problem.This kind of cutting-edge scientific discussion can often find more shortcomings in human science.

What is “gravity” and why does it occur?I don't know that one of the four basic forces of gravity has always been a mystery.

Einstein’s theory of general relativity points out what gravity really is, but this theory has a serious conflict with another great discipline, quantum mechanics.So that people have not been able to unify these two disciplines until now, and the "quantum gravity theory" that people once wanted to build has not succeeded.

Without understanding the essence of gravity, it is difficult to use it, so the gravitational wave telescope cannot be built.

"All right, gentlemen, ladies and gentlemen."Yu Yifeng frowned and said, “I am not here to listen to you whine, I just want to ask, is the gravitational telescope possible?”

"No, the gravitational waves are really too small."

The answer from the position is Professor Thomson, astronomer: "It is impossible in terms of human technology!"But... one of the large devices we removed from a flying saucer is a gravitational-wave telescope!Moreover, after partial restoration, it should be used normally.”

“It requires extremely high computations to function properly.After all, there are as many celestial bodies in the universe as many as cattle, each producing its own gravitational waves, all mixed together, and it takes extremely high calculations to solve these equations of characteristics.”

Scientists are reluctant to use this alien creature because not knowing its structure means unsafe and unreliable.But now there is no way to do it, just put it forward.

“Is the computing power of our central computer enough?”Yu Yifeng asked.Noah's central computer is the most advanced computer on the moon base and even on Earth, calculating at about 1 billion times per second.

“No, with a computer like this, to solve the equations of a billion variables, the time required ... 100 years!”Professor Thomson shook his head, "So this instrument has never been used."

“If we can build a higher-speed computer, we can really make good use of this alien creature.”