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Next, the two civilizations are caught in an eerie equilibrium......

After the Green Light Civilization was stationed on Saidna, it began to collect resources on a large scale and repair ships. With the attitude that more is better than less, they don't want to have much communication with this seemingly more powerful "new human civilization".

They don't know if casual communication will anger each other. In order to reduce unnecessary trouble, they even hid behind the star Sedna, allowing a planet to block them.

Similarly, the human Noah has been floating in the Martian atmosphere, drifting with the Martian rotation. Humans also don't want to have too much communication with the green light civilization.

But if Noah is to land on Mars, it will have to overcome air buoyancy, that is, it will have to carry a lot of heavy objects outside Noah. This landing method is really strange, maybe it will be seen by the green light civilization.

For the sake of prudence, Yu Yifeng never gave the order to land. However, humans are not very eager to gather resources, because those low-end robots are more likely to cause humans to show their stuff.

Fortunately, after such a long period of mining, Noah's material reserves have been extremely rich, and even if there is no material replenishment from the outside world, people can work normally.

What mankind needs most urgently now is a more powerful means of observation! This is also a project that Yu Yifeng focuses on supervising.

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

With the current observation capabilities of people's astronomical telescopes, the opposing spacecraft is only a very small dot, and it is difficult to see the specific situation clearly.

When the sunlight reached the position of Sedna, it was already very faint, and the reflected light from the planet was almost non-existent, making it difficult for ordinary astronomical telescopes to see. And the green-light civilization alien spacecraft hiding behind the planet is even more difficult to observe. Humans can only estimate the specific location of the opponent's spacecraft by the leakage of the opponent's infrared light.

But since the alien spacecraft was stationed on Sedna, perhaps because a large number of engines were turned off, the infrared light leaked so little that humans often lost the vision of the alien spacecraft.

This made Yu Yifeng very annoyed, and he would never allow this unknown situation to appear. So he's 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 distance between the two antennas, the higher the resolution. In addition, when the diameter of the antenna or the distance between the two wires is constant, the shorter the radio wavelength received, the higher the resolution.

Radio interferometers can undoubtedly see more clearly than radio telescopes alone, and they have higher sensitivity.

According to the calculations of scientists, two radio telescopes with a diameter of 200 meters are distributed at both ends of Noah, and then through a series of scientific and technological means to form a radio interferometer, the highest resolution can reach one ten-thousandth of an arc second.

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

Yu Yifeng couldn't help but think. Because of the folding space, the volume inside is not small, but the surface area on the outside is a little smaller, and there is no way to place a larger telescope. Moreover, because of the restrictions on entrances and exits, Noah is very unable to enter and exit very large machinery, which is actually a major limitation of this spaceship.

In the future, science and technology will be developed, and human beings must build a more massive spaceship with Noah as the core, a spaceship with a diameter of hundreds of kilometers like the green light civilization......

This idea was only fleeting in Yi Feng's mind, and he would definitely not be able to do it with current technology. He sighed, everything had to be done on the ground. He believes that at the current speed of technological explosion, that day will not be too far away.

In addition to radio interferometers, there is another scheme, and that is the gravitational-wave telescope!

Gravitational waves were proposed and predicted by Albert Einstein, the greatest scientist of the 20th century. In physics, gravitational waves refer to ripples in the bend of space-time, propagating outward from a radiation source in the form of waves and transmitting energy.

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

Gravitational waves have a very important and unique property: they can pass through celestial bodies in their path almost unhindered. For example, light from distant stars is blocked by the interstellar medium, but gravitational waves can pass through without hindrance. This feature allows gravitational waves to carry more information about astronomical phenomena that have never been observed before.

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

“…… Gravitational waves are so weak that they cause very little fluctuation and require very accurate instruments. Until now, we have not been able to "see" gravitational waves directly, only by gravitational lenses or by slight oscillations of elastic objects. ”

In this meeting, Yu Yifeng and a group of engineers, as well as a large number of astronomical scientists, are discussing this question. This kind of cutting-edge scientific discussion can often reveal the shortcomings of human science.

What is "gravity" and why does it arise? I don't know, gravity, one of the four basic forces, has always been a mystery.

Einstein's theory of general relativity pointed out what gravity really is, but this theory is in serious conflict with another great discipline, quantum mechanics. So much so that people have not been able to unify the two disciplines until now, and the "quantum gravity theory" that people once wanted to construct has not succeeded.

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

"Alright, alright, gentlemen, ladies." Yu Yifeng frowned and said, "I'm not here to listen to your complaints, I just want to ask, is it possible for the gravitational wave telescope to be completed?" ”

"No, gravitational waves are really tiny."

Answering from his position was astronomer Professor Thomson: "It is not possible with human technology!" But...... One of the large devices we removed from the flying saucer happened to be a gravitational-wave telescope! And, after a partial restoration, it should work fine. ”

"It requires a very high amount of computation to run properly. After all, there are so many celestial bodies in the universe, each producing its own gravitational waves, all of which are mixed together, and it takes a lot of computation to solve these characteristic equations. ”

Scientists are reluctant to use this extraterrestrial artifact because they don't understand its structure, which means it's unsafe and unreliable. But now there is no choice but to mention it.

"Is the computing power of our central computer sufficient?" Yu Yifeng asked. Noah's central computer is the most advanced computer on the moon and even on Earth, with a computing speed of about 1 billion billions per second.

"No, with such a computer, it takes ...... time to solve a system of equations with billions of variables 100 years! Professor Thomson shook his head and said, "So this instrument has not been used." ”

"If we can develop a higher speed computer, we can really make good use of this alien creation."

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