Before human beings enter the era of scientific and technological development, people will think that the earth is so big and boundless. However, with the advent of human science and technology civilization, with the help of science and technology, we walked out of the earth. At this time, we realized how much ignorance we had in the past.
Standing in space, you find that the earth is so small. Compared with the sun, the earth is too small. The sun is a star in the universe. Its diameter is 109 times that of the earth, and its volume is 1.3 million times that of the earth. From the perspective of the solar system, the sun is enormous. But if you look at the Milky way and the whole universe, the sun is just a small person in the family of stars, and there are countless stars bigger than it.
So the biggest star in the universe, do you know how big it is? Some people may think that it is hundreds of times larger than the sun, thousands of times larger than the sun, and it is an unimaginable star. But the biggest star in the universe is bigger than we can imagine. There are two forms of stars before they die. One is a normal star like the sun, and the other is a red giant that expands at the end of its life.
The protagonist we are going to introduce today is a red supergiant at the end of its life, which is also the largest star discovered in the universe by human beings so far. It’s scutellus uy, about 45 million light-years from earth. It has a diameter of 2.376 billion kilometers and can hold 4.5 billion suns. Is it too big to be true? It takes 9 hours for light to go around it, while it only takes 14.5 seconds for light to go around the sun. Such a huge gap also shows that the volume of uy is really incredible.
However, because it is now an expanding red supergiant, although its volume is much larger than the sun, its mass is not too exaggerated, only 32 times the mass of the sun. Stars of this mass can be regarded as massive stars. The lifespan of such stars is very short, only tens of millions of years. When the internal fusion fuel is consumed, it expands first, then collapses inward, a supernova explosion occurs, and finally a black hole is formed.
There are three kinds of stars. A small star like the sun has the longest life span, which can reach about 10 billion years. After the end of its life, it becomes a white dwarf. And the middle mass stars will become neutron stars after death. The final result of a high mass star like uy scutellus is that it will evolve into the most powerful celestial black hole in the universe. It can be seen from this that the one who was strong in life will still be the dominator of the universe after death. The strength of celestial bodies in the universe is based on the mass.
A star like uy in shield, from birth to death, is very short on the cosmic time axis. Compared with the life span of 10 billion years of the sun, its life span is only thousands of years, which is too short. It is precisely because the life of such stars in mass is too short, so it is very difficult to have a life planet around them, and even less likely to have intelligent life.
Only when a small star like the sun has a life span of 10 billion years, can the planets around it have the possibility of life and intelligent life. The earth should be lucky to be born in the solar system, accompanied by a small mass star. And humans should also thank the universe for allocating such a small mass of stars and Suns to the earth.
Although the life of the sun is very long, it has finally come to the end of its life. Now the sun has gone through 5 billion years, and another 5 billion years, it will die completely, and then continue to expand and evolve into a white dwarf. When the sun expands and transforms into a red giant, its volume will also expand rapidly, engulfing the orbit of mercury, Venus, and even the orbit of the earth .
Even if the earth survived and was not engulfed by the expanding sun, at that time, the earth will be very close to the earth. The earth will take the place of mercury, and the surface temperature will reach hundreds of degrees Celsius, just like the high temperature environment on the surface of Venus. With such a high surface temperature, the liquid water on the earth’s surface will disappear, and most of life will be unable to adapt to the high temperature environment and die out. What will be the fate of human beings?
In fact, we don’t have to worry about the extinction of humans after the sun turns into a red giant. If the sun is now expanding to become a red giant, there is only one way to destroy the fate of mankind. However, it will take billions of years for the sun to become a red giant. With the development speed of human science and technology, we can achieve our present achievements in hundreds of years. If we develop for billions of years, we can’t imagine how powerful human beings will be at that time.
Although in a few billion years, the scientific and technological strength of mankind may not be the most powerful in the universe, it is believed that there will be no big problem in crossing the Milky way. In fact, after the speed of light has been realized, we can explore a lot more areas. It is not difficult to find a planet suitable for human survival in the galaxies near the solar system. At that time, human beings will also start interstellar migration instead of being bound to the earth.
With the development of science and technology in billions of years, it is quite possible that the speed of light flight has been achieved. In this case, we have the ability to travel all over the galaxy, and countless planets suitable for human survival will be found. Human beings have also opened the era of galactic colonization and spread all over the galaxy. At that time, the earth was just the birthplace of human beings.
Therefore, billions of years later, even if the sun expands into a red giant, threatening the earth, people living on the earth can give up the earth and migrate to other human colonies in the galaxy. Of course, we can also install a planetary engine on the earth to make it a wandering planet and leave the solar system. Such a thing can’t be done now, but for human technology billions of years later, it’s not a thing at all.
In fact, we are more worried about the threat to the earth and human beings caused by the expansion of the sun into a red giant for billions of years than the deteriorating ecological environment of the earth. Whether our earth can survive for billions of years remains a question. With the earth’s deteriorating ecological environment, Hawking once predicted that the time left by the earth to mankind may be only a few hundred years.
If the earth’s environment continues to deteriorate, it is really possible that in a few hundred years, the earth will no longer be suitable for human survival, and then we will have to give up the earth and move to other planets. Therefore, it is too far for human beings to do things in a few billion years. Only when we make efforts to protect the environment and ecology can the Earth last for billions of years.
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