Isn t the universe big, and why is it so big?

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.

The universe is large**, theoretically speaking, it is a particle with an extremely high density and approaching infinite size, which is produced under sudden high temperatures. As mentioned earlier, the density is close to infinity. The power of the universe is not particularly great, you can do an experiment.

An experiment on the power of **. Find two airtight jars, which don't need to be particularly large, about 10 milliliters. One of them was filled with a small amount of gunpowder, and the other was filled with gunpowder.

Then seal it up. Burn in a fire and observe the power of the two sealed jars**. You will find that a sealed jar filled with a small amount of gunpowder is not very powerful, while a sealed jar filled with gunpowder is particularly powerful.

That's the issue of density. And as I said earlier. The universe is theoretically a particle with a density approaching infinity at high temperatures.

So it's so powerful that people can't imagine it.

In the vast universe, our earth is not even a grain of sand. Existence is meaning. The meaning of the universe does not need to be defined by human beings, there are human beings with the universe, and without human beings, there will hardly be any change in the universe. How to define the meaning of the existence of the universe with the insignificance of human beings.

Humans observe the universe and discover distant galaxies.

The phenomenon of redshift of stars.

As well as the cosmic microwave background, it is possible to infer the situation of the universe in the early days, and scientists believe that the original cosmic matter, dark matter.

and so on are in a relatively small area, which is the origin of the big ** six years.

The universe is so large because of the long history of development, within 13.8 billion years after the occurrence of the big **, due to the initial ** impact and dark matter, dark energy.

As a result of the action, the universe continues to grow, and the universe is now observable by human beings.

With a diameter of 93 billion light-years, there are about 100 billion galaxies, each with more than 100 billion stars.

The universe is so big is the result of observation, not that the universe is so big, but that the activities of matter, dark matter, and dark energy on a large scale make the universe so big, and matter is composed of various celestial bodies, such as stars, planets, neutron stars, etc., which are the result of the accumulation and contraction of matter, according to the law of material activity, the universe should gradually shrink; However, the universe is constantly expanding, and it can be inferred that there is some kind of energy that pushes the matter of the universe to expand, and this mysterious energy is called dark energy, which pushes the universe to expand until it falls apart.

Dark matter is the observation of celestial systems such as galaxies.

Although it has not been directly observed, there is already evidence that it can prove the existence of dark matter, which is used to maintain the state of galaxies together with matter, so that the universe will not dissipate so quickly.

The universe itself is not conscious, it does not grow actively, all phenomena are the result of the movement of actual existence in the universe such as matter, dark matter, dark energy, etc., and the universe does not grow by itself, but continues to expand and expand under the guidance of some laws observable by human beings.

At first, scientists thought that the expansion of the universe should be decelerated, which is like throwing an apple on the earth, and under the action of gravity, the apple will slow down until the highest point and the velocity is zero, and then accelerate back to the earth. At first, scientists also believed that the evolution of the universe should be like this, and as the universe decelerates and expands, it eventually stops expanding and begins to accelerate contraction, which is the Great Collapse Model. But with the development of observational technology, scientists have found that the universe begins to expand at an accelerated rate at a certain point through the observation record of IA neutron stars, which is very strange

It's like throwing an apple upward, the apple doesn't fall back and accelerates up to escape from the earth. This means that there is a pusher that is accelerating the expansion of the universe, and that pusher is "dark energy". The universe is going to get bigger, does that need meaning?

Not really. In addition, let's talk about the meaning of the existence of the universe, the universe is not like human beings, it is a thinking life, a thinking life, and the meaning is no different from the universe without a sense of life. But for human beings or for life, the universe is the basis for the birth of life, and if the universe had never existed, life would not have been born, and without the birth of life, there would be no human beings today.

In short, we don't know whether the entire universe has a size or a boundary, but hundreds of billions or even trillions of galaxies are a lower limit. The greatest significance is to affirm that the wisdom of life civilization is very likely to be not only our human beings - there are hundreds of billions of stars under countless galaxies, and each star has almost multiple planets, and only the third planet of the solar system has given birth to life and evolved intelligence.

Scientists are convinced that the universe was formed by a big ** that occurred about 15 billion years ago. Before the ** happens, the matter and energy in the universe are gathered together and condensed into a very small volume, the temperature is extremely high, and the density is extremely high, and then the big ** happens. All the galaxies, stars, planets and even life that appeared in the universe were gradually formed in this process of continuous expansion and cooling.

The expansion of the universe was slightly slower than light at the beginning of the universe, and although the rate of expansion has slowed down since then, it has expanded very much in such a long time.

The universe is vast and infinite, boundless, beginningless, and endless. The infinity of the universe does make humanity feel incomprehensible and broken. At present, the universe as human cognition is still limited to the theory that the universe originated from the formation of the "universe **", and in order to solve the mystery of the universe, human beings need to continue to explore a lot of research and discoveries in the future in order to further reveal the secrets of the universe.

Because the universe has been expanding from small to large, it is said that it is so big now.

The answer on the first floor is perfect, it is recommended to watch the documentary "how the universe work" to understand how the universe works, you will find that the universe is so big that it shocks you, makes you melancholy, and makes you insane.

Size is a relative concept. See who you compare.

The universe is unimaginably big. To analogy, our earth is like an ant compared to the sun, and the sun is like an ant compared to Sirius, and Sirius is also an ant compared to the Milky Way, and the Milky Way is not even an ant in the entire universe....Navigation in the universe is measured in the speed of light, and the distance of the stars in the universe is calculated in light years, and it may take tens or even hundreds of millions of light years to get from one star to another....The universe is terrifyingly big.