# How big is the universe? A small spot could contain hundreds of billions of stars

With the rapid development of science and technology, when human beings walk out of the earth and see the vast universe, they will know how ignorant human cognition was in the past. Standing on the earth, you will never know how small the earth is. Only when you really stand outside the earth and look far away, can you really realize that the vast universe is so big that we can’t imagine. How big is the universe? A small spot could contain hundreds of billions of stars.

When we stand on the earth and look up at the sky, we can see countless stars. Except for a few planets that are close to the earth, such as Venus and Mars, most of the other stars are like the sun. From the angle of the earth, we will find that stars are only the size of rice grains, because they are too far away from the earth, at least a few light years, at most hundreds or even hundreds Thousands of light years.

On the earth, our distance unit is meter, and a big step of human is about one meter. When we step out of the earth and stand at the angle of the universe, the basic distance unit becomes light years. One light year equals 9460.5 billion kilometers. Is this number beyond our imagination? In fact, it’s nothing. The light-year distance unit of the universe is equivalent to the meter scale on the earth.

The solar system is the home of the earth. It has eight planets. The diameter of the solar system, including the Oort nebula, has reached more than one light year. At the speed of human spaceships, it may take more than ten thousand years to fly out. Out of the solar system, you will find that the solar system is only one of the hundreds of billions of galaxies with the Milky Way coefficient. The diameter of the Milky way reaches more than 100000 light-years, and it takes 100000 years to fly at the speed of light to get out of the Milky way.

In our opinion, the speed of light is also hopeless in front of the universe. A photon wants to travel all over the universe with full enthusiasm. It thinks that the photon with the speed of light can travel in the universe, but it finally finds that it is possible to exhaust its life, and it is impossible to reach the end of the universe. The solar system is a grain of dust in the Milky way.

Walking out of the galaxy, you will find that the outside world is bigger. The diameter of the Virgo supercluster reaches hundreds of millions of light-years, which contains hundreds of billions of galaxies like the Milky way, and the Milky way is also a grain of dust in front of the Virgo galaxy.

More than 200 years ago, French astronomer Charles Messier found several dim light spots in the night sky. In order to distinguish them from comets, Messier compiled a list to record these strange light spots. Over time, the number of “Messier catalogue” has gradually increased to more than 110. At first, people thought that these light spots were just interstellar gas or dust scattered in the Milky way. With the progress of astronomical observation technology, scientists were surprised to find that they were as large as the Milky way, and each galaxy contained hundreds of billions of stars.

Hubble Space Telescope once photographed the next cosmic background picture. In one picture, we will see countless dust light spots, some large and a little small. These light spots are much more than the stars in the sky when we stand on the earth. In fact, these light spots like rice grains and dust are galaxies at least as big as the silvery system, and each light spot contains at least a small amount of dust It contains hundreds of billions of stars.

Galaxy M49 (also known as NGC 4472) is an elliptical galaxy with a diameter of 160000 light-years, about 55.9 million light-years away from earth. It is one of the brightest galaxies in the Virgo supercluster. The clear image of M49 captured by the Hubble Space Telescope is that the light emitted by 200 billion stars is intertwined to form a dazzling spot. There are about 6000 globular clusters in the spot, most of which are over 6 billion years old and older than the sun. The massive black hole at the center of galaxy M49 has a mass of more than 500 million suns.

If you think that the Virgo supercluster is already very big, then if we go out of this supercluster, you will find that there are still boundless stars outside. There are so many galaxy clusters like the Virgo supercluster that it is impossible to estimate. In the vast universe, the Virgo supercluster is just a little bit of dust. So how big is the universe?

Scientists have no definite answer to how big the universe is. At present, the scope of the universe that human beings can observe has reached 92 billion light-years. The sphere is so large that we can’t imagine. However, it is only based on the limited and relatively backward science and technology of human beings. With the continuous progress of human science and technology, the continuous upgrading of astronomical observation equipment, and the future development of science and technology The observable scope of the universe will continue to expand, with a sphere of 92 billion light-years. It is possible that in front of the vast universe, it is only a bit of dust, and it may not even be the tip of the iceberg of the universe.

The more we know about the universe, the more we will feel that human science and technology is really nothing in front of the universe. Human science and technology will become more and more powerful, the speed of spacecraft will become faster and faster, and the starry sky we can explore will become wider and wider. But in front of the vast universe, what speed should our spacecraft reach to reach the boundary of the universe?

This speed may have gone far beyond our understanding of speed. Even if the speed of a spaceship reaches superluminal speed, the scope of the universe that can be explored may be limited. In order to really travel through the universe and explore the boundary of the universe, it may need to transcend the mode of the concept of speed. Then what is the way in the universe to freely shuttle through the universe Every corner of the world?

If human beings want to realize the dream of exploring the mysteries of the universe, it may be very difficult to realize it. Even if human beings can continue to develop for tens of millions of years, we may not be able to reach the end of the universe. Don’t forget, after the big bang, the universe has been expanding rapidly, and the expansion speed exceeds the speed of light.

With the rapid development of human science and technology, the universe is also expanding rapidly. Of course, the power of science and technology is powerful. It is possible that mankind will have super observation equipment in the future, which can directly penetrate the universe and see the outside of the universe. At that time, the size of the universe will be determined. It is believed that the universe is unlikely to be boundless. It must also have boundaries. If multi cosmology can be confirmed in the future, it will not be too difficult to understand the size of the universe. We are looking forward to that day.

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