How big is the universe? Is the universe infinite, or is it bounded?

At present, the scope of the universe observed by human beings is finite, and no one can know the actual size of the universe, and the possibility of infinite scale cannot be ruled out.

More than 400 years ago, human beings thought that the solar system was everything in the universe, and the world was only divided into heaven and earth.

Later, Galileo invented the telescope, and human beings saw more celestial bodies in the solar system, and gradually realized that the Milky Way in the night sky is composed of many stars, so the concept of the Milky Way was born.

Until the beginning of the last century, the famous American astronomer Edwin Powell Hubble used the Cepheid variable star method to determine the stars of some extragalactic galaxies, and found that the distance of these stars was beyond the range of the Milky Way.

Therefore, there is the concept of "cosmic island" in astronomy, which means that the galaxies in the universe are like islands in the ocean, and there are many "islands" in the universe, and our galaxy is only one of them.

The discovery of Hubble opened the curtain on modern astronomy, and Hubble is also known as the father of galactic astronomy; Later, Hubble also discovered the expansion of the universe, put forward the famous theory of the universe, and gave the famous Hubble's law. Since then, the theory of the universe has become an important basic premise of astronomy, and has also been confirmed by many astronomical observations.

According to the theory of the universe, our universe began with a surge 13.8 billion years ago, in which energy is gradually converted into elementary particles, which are cooled to form various atoms, which combine into molecules and then form celestial bodies in the universe.

**DescriptionAccording to Hubble's law and astronomical observations, the distance from us is too far away, and the light does not have enough time to reach the earth, so there is the concept of the observable universe, our universe has expanded for 13.8 billion years, and the current observable universe diameter is about 93 billion light years.

As for the actual extent of the universe, it is impossible to know, if the theory of the universe is correct, the actual size of the universe should be limited; If the theory of the universe is incomplete, then the universe does not rule out infinite possibilities, and as for the truth, no one knows now.

The size of the universe is like the size of the earth compared to that of human beings, and this size is derived by comparison, but I think that the universe has a boundary, because I believe that there are people outside of people, and there are mountains outside of the mountains, but we are so small that we have never seen it.

The universe is very large, infinite, and no scientist or astronomer can answer the exact breadth, but I believe there are no boundaries.

The universe is infinite. The universe has no boundaries, and now science and technology can't find the edge of the universe at all.

The universe has a boundary, but for us humans, it is almost the same as infinity, and the universe is constantly expanding at the speed of light, never stopping.

The universe contains all space, time, and matter. It starts with the big ** of the singularity. The universe is about 13.8 billion years old, and its current observable diameter is 93 billion light-years.

Observable means that so far, we have only observed 93 billion light-years, and in fact it is larger than 93 billion light-years, which is an astronomical ,..We can't experience it without physical contact. One light-year refers to the distance traveled by light in a year in a vacuum.

This means that it would take 93 billion years for light to travel in a straight line in the observable universe.

How big is <> universe? Is it unlimited? We think the universe is"Unlimited"But there is no clear answer to how big the universe really is.

None of the great scientists, from Galileo to Newton to Einstein, commented on the size of the universe. Whether it is finite or infinite, we do not know, but the development of science and technology remains unexplained. So-called"The boundless expanse of the universe", but is the universe really infinite?

According to what is currently known,"I'm afraid it's infinite, right? "

However, in reality, no one really knows the answer. The answer may come later, but it is not known at this time. But why do scientists think the universe will expand indefinitely?

Is the universe infinite? Does it have an end? The answer from scientists is surprising, and the universe is huge.

It includes the Earth we live in, all the planets in our solar system, and all the stars that float in the night sky, even galaxies that are too far away to see.

Until recently, it was believed that all the stars floating in the night sky existed in the universe. And Edwin Hubble, he changed that. Hubble's discovery is so fascinating,..

So much so that the Hubble Space Telescope got its name from him. Hubble discovered that these spots were formed by stars and that they were very far apart, a discovery that detonated the concept of the universe.

The universe is infinite, no one can calculate, and scientists are constantly researching it. It's really boundless.

There is still some controversy about the size of the universe, but the universe is certainly very large, and it is likely to be boundless.

The universe is endless. And it's really boundless, vast stars, and the universe is very big.

1. The universe is boundless, and so far, no one knows how big the universe is, even scientists don't know the end of the universe at all.

2. Scientists estimate that there are about 100 billion galaxies in the universe, but the Milky Way is only one of them, there are about 100 billion stars in one galaxy alone, and the sun we are usually familiar with is just an ordinary star in its hand shape. The universe is so vast that the distance between celestial bodies must be measured in light-years, but one light-year is equivalent to all the distances traveled by light in a year, about 10 trillion kilometers.

No. Before we ask this question, it should be added that once the European Space Agency's Planck mission published the most accurate and detailed map of the universe's oldest rays ever recorded, showing that the universe is 13.8 billion years old. Planck calculated this age by studying the cosmic microwave background.

In other words, the maximum radius of the observable universe is 13.8 billion years and the diameter is 27.6 billion years (see figure below).

So, how did the observed boundary of 46 billion years and the diameter of the universe of 92 billion years come to be? We know that the universe is expanding in its constant distraction. If expansion occurs at a constant rate during the lifetime of the universe (Hubble's constant), the same place today would be 46 billion years away, making the diameter of the observable universe a sphere of about 92 billion years.

<> it seems, the Earth is the center of the universe. However, like that ship in the ocean, we cannot judge where we stand on the vast span of the universe. We can't see the land, and the gods don't slow down means that we are in the ocean; Just because we can't see the edge of the universe doesn't mean we're lying in the center.

From our vantage point on Earth, we infer that the observable universe is 13.8 billion years in size in every direction we look at – in other words, we infer that we are at the center of a sphere with a radius of 13.8 billion years.

However, this does not mean that we are at the center of the universe; It simply means that we are at the center of the observable universe. A fundamental principle of our understanding of the universe itself, called the Cosmological Principle, states that the universe is homogeneous and isotropic at its greatest scale. That is, as a whole, from any favorable point of view, the universe would be measured as a spherical observable universe with a radius of 13.8 billion years.

What's the point? As it turns out, there are several possibilities. First, the universe may be much larger than the parts we actually observe.

If the universe has what we assume every day on Earth"Flat"The geometric shapes, then the cosmological principle means that the universe must be infinite as every"The Edge of the Universe"of observers must observe the same global parameters.

No one knows the size of the complete cosmic pose, but Senda alone has trillions of planets in the solar system alone, which is huge. In other words, human beings can actually see the boundaries of the universe without knowing it.

The universe is boundless, and only a part of the universe can be seen with high-tech telescopes, and human beings cannot see the boundaries of the universe.

There is no specific standard data for this, and with the current technology of human beings, it is impossible to see the boundaries of the universe.

The vast universe, the vast life, looking up at the starry sky, we will think about a lot of questions, whether the universe has boundaries or not, this is a question that is often raised but has no answers, thinking that the universe has boundaries or no boundaries will lead to contradictory conclusions.

Does the universe have boundaries? That is, whether the universe is infinite or not, the universe includes time, space and matter, scientists believe that the universe originated 13.8 billion years ago, a hot and dense singularity occurred** produced the current universe. With the help of space telescopes, human beings can observe the universe tens of billions of light-years away, so the universe is limited, but another question arises, what is outside the finite universe?

What we humans can recognize, time, space, and matter, are only at the rough level, and we can recognize the state of matter beyond time and space? It has been argued that even though there is no matter, absolute space exists.

Modern scientific theories believe that matter is not continuous, time is not continuous, space is not continuous, and for particles at the quantum level, time and space are invalid, that is to say, quantum can span time and space. How to understand the intermittent part of space and time, it is connected with the material universe, absolute nothingness, we can't use the view of time and space to see absolute nothingness, if absolute nothingness is the ocean, then matter, the universe is born in the ocean, and it is constantly born and destroyed, if you are a quantum, this ocean is the same before the birth of the universe, now, in the future, let's call it anywhere. If you are subject to the shackles of matter, you will not be able to know this ocean.

If you exist in a quantum state, you can travel before the birth of the universe, the period of the dinosaurs, you can feel the rise of civilization, the destruction of the stars, and you can think that your current position is the so-called edge of the universe, you are in any position in the universe.

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 were to be emitted from the galaxy at a speed of 300,000 kilometers per second, it would 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 is at the edge of the universe at 13.7 billion light-years, based on its regressive expansion at the speed of light

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.