Dahan Technology Empire

The development of science and technology has continuously improved the ability of human beings to understand the world, and human beings have become more and more aware of the world they live in, and know more and more things.

In ancient times, when humans drew a map of their own life, they often used mountains, rivers, etc. as references. The maps drawn were at most hundreds of miles within their own living range, and they were often not clear and accurate. .

With the further development of science and technology, human beings have entered a feudal society. In this period, human beings have had special personnel to study the world they live in, such as ancient Chinese astrology officials. The moon, stars, etc., the maps drawn are very vast, and the relative accuracy is not satisfactory.

In modern times, with the rise of modern scientific ideas, the development of the Western Enlightenment, and the rise of humanities, for the first time, human beings have a relatively correct understanding of the time they live in, and know that they live on a huge ball. , and with the rise of great voyages, the world map gradually became clear.

In the 20th century, with the development of aerospace technology, human beings began to view the world they live in from space, and recognized the world they lived in very intuitively and clearly, and drew a world map with high precision, even where they were. of galaxies are known enough to be able to map them out.

Later, with the development of the empire's technology, human beings officially entered the universe and galloped across the entire galaxy. In the galaxy, how to determine their position and distance, and how to accurately draw a star map of the entire galaxy, scientists It is very clever to use pulsars for precise positioning, so that you will not get lost in the universe.

Now the empire has reached level 6 cosmic civilization and has become a real cosmic civilization. To mix in the universe, how to map the large Virgo galaxy cluster, the galaxy cluster where the Milky Way is located, how to accurately measure the distance between the galaxies, etc. This problem has been bothering the cosmos and astronomers of the empire for a long time!

As early as a long time ago, cosmic astronomers actually mastered a method that can measure the distance between galaxies-Cepheid variable stars!

Cepheid variable star is a kind of variable star. Its light cycle (that is, the time of brightness change for one week) is proportional to its luminosity, so it can be used to measure the distance between stars and galaxies. Most of these variable stars are F-type stars (hot stars of moderate temperature) when their luminosity is extremely large; they are G-type stars (cooler stars like the sun) when their luminosity is extremely small.

The typical star is δ Cephei. In 1784, John Goodley discovered its light variation phenomenon. In 1912, LeWitt of Harvard Observatory discovered the period-luminosity relationship of the above-mentioned Cepheid variable star.

Cepheid variables are a class of highly luminous periodically pulsating variable stars, that is, their brightness varies periodically with time. It is named after the typical star δ Cepheus (Chinese name Cepheus 1). Because the distances of star clusters and galaxies can be determined according to the period-light relationship of Cepheid variable stars, Cepheid variable stars are known as measuring rulers.

The method of Cepheid variable stars can measure very long distances between galaxies, so it can get the title of measuring ruler, but in essence, this method is to study what you can receive from distant galaxies. In the distance of millions of light-years between river systems, it takes millions of years for light to spread.

So the light from the Andromeda galaxy and the Triangular-shaped galaxy that we see in the Milky Way is all the light emitted by millions of years. It is not special to study these lights to measure and speculate the distance between the galaxies Accurate, and more importantly, there is no way to know the precise location of the river system at a long distance.

You must know that the Andromeda Galaxy, the Milky Way, the Triangulum Galaxy, etc., are moving along an unknown trajectory at high speed every moment, and the positions of millions of years of time movement will be very amazing. Errors can be huge.

Now the empire is going to expand the galaxy outside the galaxy. Although the space teleportation technology is awesome,

But if you can't even do the precise positioning, then the deviation of the space transmission will be further enlarged, and there will already be a deviation. You can't even get the current precise positioning of the river system, and the deviation will be very alarming , Maybe a space teleportation is teleported to the sea of ​​death between the river system and the river system, that would be miserable!

The cosmic astronomers of the empire continued to study, and finally came up with two methods that can span long distances, calculate the long distances between river systems in real time, and at the same time accurately locate the river systems, the deviation will be very small.

One is the space fluctuation method, the principle of which is to use the fluctuations produced by the super-large black hole at the core of the river system to squeeze the space to measure the long distance between the river systems, and the distance between the river systems can be measured according to the size, frequency, intensity, etc. After measuring the mass of the black hole at the core of this river system, we can further infer the size of this river system.

Because the size of a river system is inextricably linked to the black hole at its core, the larger the mass of the black hole at the core and the stronger its gravitational force, the more interstellar dust and matter it will attract, the wider the range of gravitational influence, and the more prosperous the entire river system will be; on the contrary The black-centered black hole in a river system has a small mass and weak gravitational force, which attracts less interstellar dust matter, and the whole river system is poorer and much smaller.

Another method is to measure the distance between the river systems and the situation of the river system itself according to the theory of cosmic space-time ocean currents. According to the theory of cosmic space-time ocean currents, the entire universe is conventionally transmitted by countless space-time ocean currents. These cosmic space-time ocean currents have large There are small ones, which connect every river system in the universe.

The mass and range of the river system itself can be measured by the size of the space-time ocean current connecting the river system, and the current position of the river system can be measured according to the movement of the space-time ocean current!

These two methods are researched by the astronomers of the Imperial Cosmos. They are very accurate and can measure the distance of all the river systems around the Milky Way in real time, and can also estimate the prosperity of the river system.

Among the galaxy clusters centered on the three galaxies of Andromeda, Milky Way, and Triangulum, Andromeda ranks first in mass. The black hole at its core is twice as massive as that of the Milky Way. The entire Andromeda The diameter of galaxies exceeds 220,000 light-years, and the diameter of the Milky Way is only 120,000 light-years!

As for the third-ranked Triangulum galaxy, the mass of it and the core black hole is only half that of the Milky Way, so scientists can accurately calculate the diameter of the Triangulum galaxy, and its diameter is only about 60,000 light-years!

Furthermore, in terms of prosperity, the most intuitive thing that can reflect the prosperity and barrenness of a river system is the number of stars in the river system. The number one Andromeda galaxy has more than 1 trillion stars, which is a very scary and Huge number, the number of stars in the Milky Way. The scientists of the Empire can give an accurate number. The Milky Way has 500 billion stars, while the Triangulum Galaxy has only about 80 billion stars, which is considered a very barren galaxy!

Only by mastering the real-time positions of these river systems can the space scientists of the Empire use space transmission technology to transmit them to distant river systems very accurately. There is also a gap in the distance. Even if you master the space teleportation technology, it is not a simple matter to reach other river systems.

This is like attacking with a long-range missile. The missile itself produces some errors. If you cannot accurately know where you are and where the target is, then your missile wants to attack the target point very accurately. This is almost impossible. possible things!

The distance between the river systems is really too far, at least for now, it is often a distance of millions of light years, and light has to travel millions of light years, plus the movement of the river system itself, If only relying on the spectrum to calculate the distance between the river systems and the real-time precise position, it is almost difficult to get a satisfactory result.

At least for an empire that needs space teleportation, such a result is unacceptable. It is necessary to obtain a real-time precise location, and it is necessary to have sufficient knowledge of the river system before expanding.

What is the quality of the river system, how big is the scope, how many star systems are there, what is the structure of the river system itself, the level of the local civilization of the entire river system, etc., only on the basis of sufficient understanding can the empire rest assured And boldly invade the entire river system!

The mass of the black hole at the core of the triangular galaxy 2.64 million light-years away from the Milky Way is not too large. Taking the mass of the central black hole of the Milky Way as the standard, the mass of the black hole at the core of the triangular galaxy is only 0.56, while the mass of the black hole in the Andromeda galaxy has reached 2.12!

Because the mass of the core black hole is relatively small, it cannot compare with the Milky Way and the Andromeda Galaxy in many aspects such as gravity, but the Triangular Galaxy is still a huge galaxy, not the satellite galaxies of the Milky Way like the Large Magellanic Cloud. compared to.

According to its structure, the river system can be roughly divided into four categories: spiral galaxies, barred spiral galaxies, and irregular galaxies. Of course, different classification methods will have different classifications. Currently, imperial scientists generally recognize these four categories. Classification.

The Milky Way, the base camp of the empire, is a barred spiral galaxy. The middle of the galaxy is like a stick, hence the name; the Andromeda galaxy is a very typical spiral galaxy with a huge disk-shaped structure; and the triangular galaxy that the empire is about to conquer is Very typical spiral galaxy!

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