Who knows how big the universe is? How big the universe is, how big is the universe

The current radius of the universe is about 46.5 billion light-years, with a diameter of 93 billion light-years. However, 93 billion light-years is only the diameter of the universe that we can observe, and since the universe is expanding faster than the speed of light, we cannot know how big the universe really is if we only observe the universe from Earth, which is still an unsolved mystery.

Huainanzi Yuan Dao Xun": "The universe and the three lights." "High lure:

The four directions are said to be the universe, and the universe has been said throughout the ages, in order to metaphorize the heaven and the earth. "Dialectical materialism believes that the universe is a material world, which exists objectively without relying on human consciousness, and is in constant motion and development, with no beginning and no end in time, no boundary and no end in space.

The universe is diverse and unified: diversity lies in the diversity of material expressions; Unity lies in its materiality. With the improvement of astronomical telescopes and the improvement of observation technology, the observable range of the universe is expanding day by day.

In the early 80s of the 20th century, the farthest observed celestial body was about 20 billion light-years from Earth.

According to the theory of relativity, the space of our universe is finite, but there are no boundaries. Scientists speculate that the universe is about 30 billion light-years in diameter and continues to expand. But because humans currently know so little about dark matter, the actual universe may be much larger than 30 billion light-years, but no matter how big the universe is, it is finite.

On the first floor is the view of classical physics, which has long since been abandoned.

According to the phenomenon of redshift between stars, it has been found that all stars are moving away from us, and the farther away from us, the faster the stars are. The ratio of velocity to distance is a constant, called the Hubble constant.

But doesn't that mean that a star at a certain distance can travel faster than the speed of light? Is the Hubble constant wrong? No, instead, the Hubble constant defines the radius of the universe, which is calculated to be 14 billion light-years.

Before the universe was big, there was no concept of time and space, so there was no beginning of time and the size of space at that time, because it was produced after the big **. I don't know how big the universe is today, but before the big **, there was no space, and it could be said to be zero at that time. I'm sorry, but that's all I can do for you.

The universe is finite and boundless.

It's like a two-dimensional space on the surface of a sphere.

How big is the universe? Star Awareness Project

How big the universe is

The universe is the general term for all things, the unity of time and space. The universe is a material world, which exists objectively and does not depend on human will, and is in constant motion and development, with no beginning and no end in time, no boundary and no end in space. It is said that the universe is vast and immense, and many scientists cannot say the specific range of the universe.

However, in recent years, with the continuous development and progress of science and technology, mankind has also developed more advanced exploration and testing instruments. Therefore, there are new discoveries in the range of the size of the universe. So how big is the universe?

I believe this is a question that everyone is very curious about.

The latest research suggests that the diameter of the universe can reach 92 billion light-years, and even more. Of course, some scientists also believe that the universe can no longer be described by numbers, and it needs to rely on the rich imagination of human beings to associate and depict. There are tens of thousands of planets in the vast universe, and the earth is one of the planets in the universe.

Human beings have always felt that the earth is very large and can accommodate many biological species, oceans, mountains and rivers, but the earth is too insignificant compared to the universe, and there is no comparison.

The Earth is distributed in the Milky Way, and the diameter of the Milky Way can reach 12 million kilometers, which is equivalent to 30 times the distance between the Earth and the Moon. The universe, in turn, is made up of huge superclusters of galaxies. Therefore, the scale of the universe is quite amazing, almost beyond the scope of human imagination, and there is no way for people to measure the specific scale of the universe with the distance scale that we are familiar with in life.

It is precisely because of the infinite space of the universe that people have become more curious about it, and scientists in various countries are racking their brains to try their best to accurately measure the size of the universe.

Since the universe is constantly expanding, this provides a good help for scientists to accurately measure the size of the universe, which can greatly improve the measurement accuracy of the universe. It is believed that in the near future, mankind will be able to realize the dream of measuring the universe. At that time, everyone can have a good understanding of the mysterious universe that is closely related to human existence.

How big is the universe? Star Awareness Project

How big is the universe? Star Awareness Project

According to the latest observations, the farthest galaxy that has been observed from us is 13 billion light-years. In other words, if a beam of light were to travel from the galaxy at a speed of 300,000 kilometers per second, it would take 13 billion years to reach Earth. This distance of 13 billion light-years is the extent of the universe as we know it today.

To be clear, the extent of the universe as we know it today, or size, is a spherical space centered on the Earth and radiated by a distance of 13 billion light-years. Of course, the Earth is not really the center of the universe, and the universe is not necessarily a sphere, but we can only understand this extent due to our current observation capabilities.

How big is the universe? Star Awareness Project

It is impossible to know how big the real universe is, because the universe is expanding so fast that people cannot see the deepest part of the universe at all. We can only talk about how big the observed universe is.

The universe appeared 13.7 billion years ago, and the celestial bodies in the universe were created in the big **, that is to say, the earliest celestial bodies were born 13.7 billion years ago. According to the principle that the universe is similar on a large scale, the Earth is theoretically able to receive light from these earliest celestial bodies, so the earliest celestial bodies that can be seen on Earth were born 13.7 billion years ago. The universe has always expanded, and the rapid expansion of space has dramatically increased the distance, and by the time the light of the farthest celestial bodies reaches the Earth, they have receded to 47 billion light-years away.

In this way, the farthest object that can be observed by humans is about 47 billion light-years from the Earth, and the scale of the observed universe is about 94 billion light-years.

In the Milky Way, although we use various observation techniques, there is a limit to the extent of the universe that humans can observe. Imagine that you are on a ship in the center of the ocean, and if you look around, the only thing you can see is the water within a certain distance. However, we know that the extent of the Earth's surface is much larger than the horizon.

The farthest limit we can observe is called the cosmic horizon, which is about 13.7 billion light-years (about 80 billion trillion trillion miles) away from us in all directions. The extent within the horizon of the universe is called the observable universe.

As for the part of the universe that is above the horizon of the universe, there is no scientific way to measure its size. At the same time, there is no reason to think that there is or does not have a boundary in the far reaches of the universe.

How long is the time and how big the universe is.

Actually, you can use a formula.

With the center of the universe as the spherical star, and the speed of light * cosmic lifetime as the radius.

Calculate the volume of this ball, which is the size of the universe.

According to the Great ** Doctrine.

How big is the universe? Star Awareness Project

According to the latest observations, the farthest galaxy that has been observed from us is 13.7 billion light-years. That is, if a beam of light is emitted from the galaxy at a speed of 300,000 kilometers per second, it will take 13.7 billion years to reach Earth. This distance of 13.7 billion light-years is the extent of the universe as we know it today.

To be clear, the extent of the universe as we know it today, or size, is a spherical space centered on the Earth with a radius of 13.7 billion light-years. Of course, the Earth is not really the center of the universe, and the universe is not necessarily a sphere, but we can only understand this extent due to our current observation capabilities.

Therefore, the universe has no boundaries, and our observation ability determines how far we can see, and our observation ability is developing, and the scope of observation is also increasing. However, according to the theory of the universe, the universe is still expanding.

The vast universe is boundless, and its depth is unimaginable, In April 1999, an astronomical research team at the State University of New York in the United States used"Hubble"The immense power of space telescopes. After more than 2 years of careful observation and scientific processing with electronic computers, more than 400 images of celestial objects overlapping in this direction were eliminated"Please"One of the oldest galaxies has emerged, and from the fact that it regresses and expands at the speed of light, it should be at the edge of the universe at 13.7 billion light-years!

The distance of 13.7 billion light-years is incomparable, and even the fastest light would have to travel 13.7 billion years to reach it. It can be seen that this farthest galaxy is also a celestial body shortly after the universe, and it is extremely precious and ancient"Cosmic fossils"Because in exploring the origin and evolution of the universe, the early history of the universe will be of immeasurable significance.

The universe is not infinite, or rather, the narrow universe we live in is not infinite. Its boundaries are still debated in what form they exist, but the idea that "our universe" is not infinite has been largely agreed.

Now there is an argument that space-time is distorted at the edge of the universe, meaning that you can get infinitely close to it, but you can't reach it.

As for the universe in a broad sense, that is, whether the universe outside "our universe" is infinite, this is not clear, just as it is impossible to talk to Xia Worm, the current human science and technology have no understanding of this, and the current research has not yet broken through the scope of our universe.

The universe is infinite, but it is bounded. Hawking's understanding of the universe is like a basketball, you can't find a beginning and an end on the surface, but it is bounded. It's like a lot of astronomy books are covered in it, if you look at Stephen.

Or it can be obtained from the big ** theory that our universe is still expanding, and galaxies are still regressing from each other, that is, the universe we know is still expanding, extending, and expanding, but it has not yet reached its end.

How big is the universe? Star Awareness Project

The universe can be said to be outside of man, there are people outside of heaven, don't think of the universe as a space.

Maybe there's an alien asking the same question as you.

I don't dare to imagine, I'm afraid that I can't fit the universe.