Since the birth of the universe by the singularity explosion 13.8 billion years ago, through continuous expansion, the vast universe has been formed, and countless galaxies such as the Milky way have also been formed. Each large galaxy contains more than 100 billion stars, and our solar system is one of the 100 billion galaxies with Galactic coefficient.
The large galaxy we live in is called the Milky way. According to the observation of scientists, the diameter of the Milky way reaches 120000 light-years, and the solar system is about 26000 light-years away from the galactic center. We all know that all celestial bodies have mass. The greater the mass, the stronger the gravitational attraction. The Milky way, which is composed of countless celestial bodies, naturally has mass. What is the mass of the Milky way?
Since human beings came out of the earth to explore the universe, they have been trying to measure the mass of the Milky way, but later found that it is too difficult to measure the mass of the Milky way. One of the reasons is that we are in the Milky way, which is the same as the fact that it is difficult for human beings to know exactly how big the earth is and how much the mass of the earth is.
The fans of the game can vividly compare the embarrassment of being in the middle of the game. Therefore, it is not until human beings have come to the earth that they can really measure the diameter of the earth and calculate the mass of the earth. In the same way, when we stand in the galaxy and observe other galaxies outside the galaxy, such as Andromeda galaxy, we can also see the shape of Andromeda Galaxy more intuitively, calculate its diameter and roughly estimate the mass of Andromeda galaxy. Therefore, it is easier to calculate the mass of Andromeda Galaxy than that of the galaxy, because we can see Andromeda The overall appearance of this galaxy.
Another reason why it is difficult for scientists to estimate the mass of the Milky way is that we are not sure how big the Milky way is and how many stars there are. Although scientists say that the diameter of the Milky way is about 120000 light-years, this is only a vague observation. Last year, Chinese scientists published a paper on the diameter of the Milky way. According to new observations made by Chinese scientists, the diameter of the Milky way may reach 200000 light-years.
We can’t determine the diameter of the Milky way, and it’s hard to estimate its mass. The last and more important reason why it is difficult to measure the mass of the galaxy is the existence of dark matter. When we observe the universe now, all the matter we can detect and see is visible matter, which only accounts for 10% to 15% of the mass of the universe, and the remaining 85% to 90% is dark matter.
Dark matter is different from visible matter in that it does not interact with light in any way and cannot reflect light. Therefore, human detection equipment can not find the existence of dark matter. However, through many phenomena in the universe and the influence of gravitational behavior, we can feel the existence of a large number of dark matter. It can be said that dark matter dominates the operation of the universe and forms the frame of the universe Without a lot of dark matter, the galaxy might have collapsed long ago, and it would not have a safe and stable cosmic environment now.
Because we can’t observe dark matter, we don’t know what the nature of dark matter is. Visible matter is made up of atoms, and the basic component of dark matter may not be atoms, so we do not know the mass calculation standard of dark matter. If we can’t calculate the mass of dark matter, it’s very difficult to accurately measure the mass of the galaxy.
Therefore, astronomers’ estimation of the mass of the Milky way eventually turned into the estimation of the mass of dark matter, so there is a big gap between the masses given, from 500 billion times the mass of the sun to 3 trillion times the mass of the sun. Finally, we can compromise and give the mass of 1.5 trillion times the mass of the sun. Of course, scientists can not accurately measure the mass of the galaxy, the main reason is that human technology is still very backward.
An important reason is that we can’t get out of the galaxy. If the speed of human spaceship can exceed the speed of light and fly out of the galaxy, standing outside the galaxy, we can see the full picture of the galaxy and accurately measure the diameter of the galaxy, so as to get more accurate information about the mass of the galaxy.
If we want to really calculate the mass of a galaxy, we must have a comprehensive understanding of dark matter. Although dark matter is still a very mysterious thing for human beings, with the progress of human science and technology, we believe that in the near future, we will be able to detect the existence of dark matter and capture it. At that time, the mystery of dark matter will be solved .
As long as human beings can capture dark matter, it is possible to understand its essence, so as to know the mass calculation standard of dark matter. In this way, we can roughly estimate the mass of dark matter in the galaxy, and then it is possible to accurately measure the mass of the galaxy. In fact, dark matter is more important for the future of mankind.
Dark matter as a huge proportion of matter in the universe, it may also be the most powerful energy in the universe. If human want to cross the universe and realize interstellar navigation, it may also need the help of dark matter. The wormhole that scientists have been exploring may also be related to dark matter. Scientists speculate that there are many space cracks in the universe. If we can open these space cracks, we will open a wormhole, which is equivalent to opening a hole in the cosmic membrane. In this way, we can realize the rapid shuttle between galaxies through the wormhole.
However, to open the wormhole, we need unimaginable powerful energy. This energy may only be powerful dark energy. Therefore, in recent years, scientists attach great importance to the exploration of dark matter. As long as human beings can understand the nature of dark matter and make it useful for us, then human beings may cross the universe, realize free shuttle in the universe, and become truly powerful in the universe Civilization.
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