How big is the whole universe in the truest sense?

The universe is about 13.8 billion years old, and the current observable diameter of the universe is 93 billion light-years. Observable means that we have only observed 93 billion light-years so far, and in fact there are more than 93 billion light-years, which is an astronomical number that we can't feel without actual contact.

Light is the fastest speed in the universe, and light-year refers to the distance that light travels in a vacuum in a year, which means that even light will take 93 billion years to complete the observable universe in a straight line.

The lifespan of 180 years of human beings is like the weight of a small ant and a mountain compared to the figure of 93 billion years. The problem of the universe may be one of the ultimate problems facing humanity. At present, the scientific community can only discuss the observable universe in a relatively good way.

What is the observable universe? As the name suggests, it is the universe that we humans can observe. As we all know, the fastest propagation speed of signals in the universe is the speed of light, and the propagation speed of electromagnetic waves, gravitational waves, etc. is the speed of light.

Therefore, the observable universe is the cosmic scope where the signals of celestial bodies have had time to reach our earth since the birth of the universe. Outside of the observable universe, the signal has not yet been transmitted, so we cannot observe it.

So, how big is the observable universe? Many people may intuitively think of an answer - the radius is about 13.7 billion light years! That's because, we know that the age of the universe is about 13.7 billion years, so the light that has just arrived at us today should of course be emitted from a distance of 13.7 billion light-years.

The idea makes sense, and if the universe is static, then this calculation is correct. But the reality is that the universe is constantly expanding! It took 13.7 billion years for a celestial body to come to us, and during these 13.7 billion years, the celestial body has been moving away from us because of the expansion of the universe, so the distance it is now from us is much greater than 13.7 billion light-years.

So, how far is this distance? Using the relevant theories of cosmology and relativity, scientists have calculated that the current observable universe has a radius of more than 46 billion light-years and a diameter of about 93 billion light-years, which is the limit of the current human horizon. What is beyond 93 billion light-years, humanity is currently not capable of exploring.

Thirty years ago, when we were in junior high school, the observable range of the conference was set at 200-30 billion light-years, but now there is progress, and I believe that in the future, science will continue to advance, and the observable range of human beings will be even greater.

The real universe is infinite.

Boundless.

The universe doesn't know how big it is now, and compared to the universe, we humans may be more fragile than ants, live in the moment, and live well.

According to scientists' observational calculations, the diameter of the observable universe is about 93 billion light-years, which is a large number, but no matter how large, it also shows that the universe is finite.

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So what's outside the observable universe? We don't know, and we probably never know, because the universe has been expanding rapidly, faster than the speed of light, and the light from outside the observable universe will never reach the Earth, and what happens there is meaningless to humans.

But it is foreseeable that there will still be a universe outside the observable universe, so how big is the real universe?

The size of the universe is one of the ultimate mysteries of the universe, and according to conventional thinking, this question can easily lead to a dead end, and finally has to rise to a philosophical question.

Conventional thinking tells us that there is an inside and outside for everything, and the universe should be the same. But if there is an "outside" in the universe, then what is the "outside" of the "outside"? There is no end to this questioning.

Everyone knows that from week to week is measured in light years. The Milky Way is just an infinite number of universes. One of the series.

In this way, the universe is infinite, and there is no way to describe it in light-year units. Billions of light-years are far more than people realize.

I just finished watching a popular science universe yesterday, and it's really super big. None of them have been explored yet. Watch a Hubble telescope photograph of one**. I thought the stars in it were small stars, but it turned out that every star in it was a galaxy.

It's really unimaginable that the universe is big.

Infinite but infinitely small, bounded but infinite.

The universe is very large, and the earth in the river universe is not as large as the dust in comparison. As for how big the real universe is, there is no way to measure it, because the universe is growing all the time, and people simply can't keep up with the pace of the universe, let alone measure it.

The universe is very large, the earth is nothing in the universe at all, because it is very difficult to explore the universe, human beings cannot explore the entire universe, and what they explore is only the things around the earth. As for the other things in the universe, no one knows, so how big the universe is, this is still a mystery, and there is no accurate data.

For the universe we can see now, this universe is 27.6 billion light-years in diameter. But the actual universe is definitely more than that, so it's just an inaccurate data. The real universe is like a child, constantly growing and expanding, and this other world is really very scary.

Because the universe is expanding more and more, astronauts can't keep up with the pace of exploring the universe at all. The universe is expanding faster than the speed of light, so it is very difficult for people to explore the universe. It can be said that this thing cannot be achieved at all, according to the current science and technology of mankind, even flying out of the galaxy is a problem, let alone exploring the universe, maybe there may really be talents in the future, measuring how big the real universe is, but that may have to wait a long time.

This universe is endless and simply cannot be described in a big way.

How big the entire universe is is still unknown to mankind.

Scientists believe that the radius of the universe may have exceeded 11 trillion light years, although the universe has only been 13.8 billion years old since its birth, but in fact, the "growth rate" of the universe, that is, the expansion rate of the universe has long exceeded the speed of light, which is also the fundamental reason why it is difficult for people to find the boundaries of the universe.

And if we leave aside the entire universe, just the solar system in which humans live, the entire star system is more than 120 kilometers in diameter, but this is not the end.

Because there is an asteroid belt called the Oort cloud on the outer side of Pluto at the edge of the solar system, if this asteroid belt is also included in the solar system, then the radius of the entire solar system would need to increase by 8 billion to 10 billion kilometers.

Surprisingly, the Solar System is only a small part of the Milky Way. Through computer simulations, scientists have found that if the Milky Way is seen as a feather, then the solar system is located at the tail end of this "feather".

Even so, stars the size of the Sun may have 100 billion to 400 billion stars in the Milky Way, and the size of the entire Milky Way is more than 130,000 light-years, its mass is about 210 billion times that of the Sun, and the distance from the Solar System to the galactic center of the Milky Way is about 100 million light-years.

The universe has been expanding since its inception, and scientists can only measure the universe within 93 billion light-years of the universe with all their might, and this distance is also the boundary of the cosmic boundary that light can reach.

Therefore, people call the universe of 93 billion light-years "observable universe", but beyond the observable universe, how big the universe is and how many stars it has is still unknown to mankind.

Theoretically, it is infinity, but in the end it is either a great freeze (expanding all the time and causing too much dispersion of energy), or a large tear (destruction due to instability), or a large collapse (after reaching a critical point**) or a phase transition (a qualitative change caused by some unqualified factor that will make everything disappear).

While the size of the entire universe is unknown, the size of the observable universe can be measured, with an estimated diameter of 93 billion light-years.