Usually, when they talk about the size of the Universe, they mean local fragment of the Universe (Universe), which is available to our observation.

This is the so-called observable Universe - the region of space visible to us from Earth.

And since the age of the universe is about 13.8 billion years, no matter which direction we look, we see light that reached us in 13.8 billion years.

So, based on this, it is logical to think that the observable universe should be 13.8 x 2 = 27.6 billion light years across.

But this is not the case! Because over time, space expands. And those distant objects that emitted light 13.8 billion years ago have flown even further during this time. Today they are more than 46.5 billion light years away. Doubling that equals 93 billion light years.

Thus, the real diameter of the observable universe is 93 billion sv. years old.

Visual (in the form of a sphere) representation of the three-dimensional structure of the observable Universe, visible from our position (center of the circle).

White lines the boundaries of the observable Universe are indicated.
Specks of light- these are clusters of clusters of galaxies - superclusters - the largest known structures in space.
Scale bar: one division above is 1 billion light years, below is 1 billion parsecs.
Our house (in the center) here referred to as the Virgo Supercluster, it is a system of tens of thousands of galaxies, including our own Milky Way.

A more visual representation of the scale of the observable Universe is given by the following image:

Layout of the Earth in the Observed Universe - a series of eight maps

from left to right top row: Earth - Solar System - Nearest Stars - Milky Way Galaxy, bottom row: Local group of galaxies - Virgo Cluster - Local Supercluster - Observable (observable) Universe.

In order to better feel and understand what colossal, incomparable with our earthly ideas, scales we are talking about, it is worth looking enlarged view of this circuit in media viewer .

What about the entire universe? The size of the entire Universe (Universe, Metaverse), presumably, is much larger!

But, this is what this whole Universe is like and how it is arranged, it still remains a mystery to us ...

What about the center of the universe? The observable Universe has a center - we are! We are at the center of the observable universe, because the observable universe is simply a section of space that is visible to us from Earth.

And just like with high tower we see a circular area centered on the tower itself, and we also see an area of ​​space centered from the observer. In fact, more precisely, each of us is the center of our own observable universe.

But this does not mean that we are in the center of the entire Universe, just like the tower is by no means the center of the world, but only the center of that piece of the world that can be seen from it - to the horizon.

The same is with the observable universe.

When we look into the sky, we see light that has been flying towards us for 13.8 billion years from places that are already 46.5 billion light years away.

We do not see what is beyond this horizon.

You probably think the universe is infinite? May be so. It is unlikely that we will ever know about this for sure. It will not be possible to cover our entire universe with a glance. Firstly, this fact follows from the concept of the "big bang", which claims that the universe has its own, so to speak, birthday, and, secondly, from the postulate that the speed of light is a fundamental constant. So far, the observable portion of the universe, which is 13.8 billion years old, has expanded in all directions over a distance of 46.1 billion light years. The question arises: what was the size of the universe then, 13.8 billion years ago? This question was asked by someone Joe Muscarella. Here's what he writes:

“I have come across various answers to the question of what was the size of our universe shortly after the end of the period of cosmic inflation (cosmic inflation - the phase preceding the Big Bang - approx. Transl.). In one source it is indicated - 0.77 centimeters, in another - the size of a soccer ball, and in the third - larger than the size of the observable universe. So which one? Or maybe some kind of intermediate one? "

Context

The Big Bang and the Black Hole

Die Welt 02/27/2015

How the Universe Created Man

Nautilus 01/27/2015 By the way, the past year just gives us a reason to talk about Einstein and the essence of space-time, because last year we celebrated our centenary general theory relativity. So let's talk about the universe.

When we observe distant galaxies through a telescope, we can determine some of their parameters, for example, the following:

- redshift (i.e. how much the light emitted by them has shifted with respect to the inertial frame of reference);

- object brightness (i.e. measure the amount of light emitted by a distant object);

Is the corner radius of the object.

These parameters are very important, because if we know the speed of light (one of the few parameters that we know), as well as the brightness and size of the observed object (we also know these parameters), then we can determine the distance to the object itself.

In fact, one has to be content with only approximate characteristics of the brightness of the object and its dimensions. If an astronomer observes a supernova explosion in some distant galaxy, then the corresponding parameters of other supernovae located in the vicinity are used to measure its brightness; we assume that the conditions in which these supernovae exploded are similar, and there is no interference between the observer and the space object. Astronomers distinguish the following three types of factors that determine the observation of a star: stellar evolution (the difference between objects depending on their age and distance), an exogenous factor (if the real coordinates of the observed objects differ significantly from hypothetical ones) and a noise factor (if, for example, the transmission of light are influenced by interference, such as dust) - and this is all, among other factors, unknown to us.

By measuring the brightness (or size) of the observed object, using the ratio "brightness / distance", you can determine the distance of the object from the observer. Moreover, according to the characteristic of the object's redshift, one can determine the scale of the expansion of the universe during the time during which the light from the object reaches the Earth. Using the relationship between matter-energy and space-time, about which Einstein's general theory of relativity speaks, it is possible to consider all kinds of combinations of various forms of matter and energy that are currently available in the universe.

But that is not all!

If you know what parts the universe consists of, then using extrapolation, you can determine its size, as well as learn about what happened at any stage in the evolution of the universe, and what was the energy density at that time. As you know, the universe consists of the following component parts:

- 0.01% - radiation (photons);

- 0.1% - neutrinos (heavier than photons, but a million times lighter than electrons);

- 4.9% - common matter, including planets, stars, galaxies, gas, dust, plasma and black holes;

- 27% - dark matter, i.e. its kind, which participates in the gravitational interaction, but differs from all particles Standard model;

- 68% - dark energy, causing the expansion of the universe.

As you can see, dark energy is an important thing, it was discovered quite recently. For the first nine billion years of its history, the universe consisted mainly of matter (in the form of a combination of ordinary matter and dark matter). However, for the first few millennia, radiation (in the form of photons and neutrinos) was even more important. construction material than matter!

Note that each of these constituent parts of the universe (i.e. radiation, matter, and dark energy) have a different effect on the rate of its expansion. Even if we know that the universe is 46.1 billion light-years long, we must know the exact combination of its constituent elements at each stage of its evolution in order to calculate the size of the universe at any time in the past.

- when the universe was about three years old, the diameter of the Milky Way was one hundred thousand light years;

- when the universe was one year old, it was much hotter and denser than it is now; the average temperature exceeded two million degrees Kelvin;

- one second after its birth, the universe was too hot for stable nuclei to form in it; at that moment, protons and neutrons were floating in a sea of ​​hot plasma. In addition, at that time, the radius of the universe (if we take the Sun as the center of the circle) was such that only seven of all currently existing star systems closest to us could fit into the described circle, the most distant of which would be Ross 154 (Ross 154 - a star in the constellation Sagittarius, a distance of 9.69 light years from the Sun - approx. Lane);

- when the age of the universe was only one trillionth of a second, its radius did not exceed the distance from the Earth to the Sun; in that era, the expansion rate of the universe was 1029 times greater than it is now.

If you wish, you can see what happened at the final stage of inflation, i.e. just before the Big Bang. The singularity hypothesis could be used to describe the state of the universe at the earliest stage of its birth, but thanks to the inflation hypothesis, there is no need for a singularity. Instead of a singularity, we are talking about a very rapid expansion of the universe (i.e. inflation) that took place for some time before the hot and dense expansion took place, which marked the beginning of the present universe. Now let's move on to the final stage inflation of the universe (time interval between 10 minus 30 - 10 minus 35 seconds). Let's see what the size of the universe was when inflation stopped and the big bang occurred.

Here we are talking about the observable part of the universe. Its true size is certainly much larger, but we don't know how much. In the best possible approximation (judging by the data contained in the Sloan Digital Sky Survey (SDSS) and information obtained from the Planck Space Observatory), if the universe is curved and collapsed, then its observable part is so indistinguishable from the "non-curved" its radius should be at least 250 times the radius of the observed part.

In truth, the extent of the universe may even turn out to be infinite, since the way it behaved on early stage inflation, we do not know except for the last fractions of a second. But if we talk about what happened during inflation in the observable part of the universe at the very last moment (in the interval between 10 at minus 30 and 10 at minus 35 seconds) before the Big Bang, then we know the size of the universe: it varies between 17 centimeters (at 10 in minus 35 seconds) and 168 meters (at 10 in minus 30 seconds).

What is seventeen centimeters? It's almost the diameter of a soccer ball. So, if you want to know which of the indicated sizes of the universe is closest to the real one, then stick to this figure. And if we assume the size is less than a centimeter? This is too little; however, if we take into account the restrictions imposed by cosmic microwave radiation, it turns out that the expansion of the universe could not end with such high level energies, and hence the aforementioned size of the universe at the very beginning of the "Big Bang" (ie, the size not exceeding a centimeter) is excluded. If the size of the universe exceeded the current size, then in this case it makes sense to talk about the existence of an unobservable part of it (which is probably correct), but we have no way to measure this part.

So what was the size of the universe at the time of its inception? If you believe the most authoritative mathematical models describing the stage of inflation, it turns out that the size of the universe at the time of its inception will fluctuate somewhere between the size of a human head and a city block built up with skyscrapers. And there, you see, only some 13.8 billion years will pass - and the universe in which we live appeared.

The site portal is an information resource where you can get a lot of useful and interesting knowledge related to Space. First of all, we will talk about our and other Universes, about celestial bodies ah, black holes and phenomena in the bowels of outer space.

The totality of all that exists, matter, individual particles and the space between these particles is called the Universe. According to scientists and astrologers, the age of the universe is approximately 14 billion years. The visible part of the Universe is about 14 billion light years in size. And some argue that the universe is 90 billion light-years across. For greater convenience in calculating such distances, it is customary to use the parsec value. One parsec equals 3.2616 light years, which means a parsec is the distance over which the average radius of the Earth's orbit is viewed at an angle of one arc second.

Armed with these indicators, you can calculate cosmic distance from one object to another. For example, the distance from our planet to the Moon is 300,000 km, or 1 light second. Consequently, this distance to the Sun increases to 8.31 light minutes.

Throughout their history, people have tried to solve the riddles associated with the Cosmos and the Universe. In the articles of the portal site you can learn not only about the Universe, but also about modern scientific approaches to study it. All material is based on the most advanced theories and facts.

It should be noted that the Universe enters big number known to people various objects. The most widely known among them are planets, stars, satellites, black holes, asteroids and comets. About the planets at the moment it is clear most of all, since we live on one of them. Some planets have own satellites... So, the Earth has its own satellite - the Moon. In addition to our planet, there are 8 more that revolve around the sun.

There are many stars in the Cosmos, but each of them is not alike. They have different temperatures, sizes and brightness. Since all stars are different, they are classified as follows:

White dwarfs;

Giants;

Supergiants;

Neutron stars;

Quasars;

Pulsars.

The densest substance we know of is lead. In some planets, the density of their own matter can be thousands of times higher than the density of lead, which poses many questions for scientists.

All planets revolve around the sun, but it also does not stand still. Stars can gather in clusters, which, in turn, also revolve around a center as yet unknown to us. These clusters are called galaxies. Our galaxy is called Milky Way... All the studies conducted so far say that most of the matter that galaxies create is still invisible to humans. Because of this, it was called dark matter.

The most interesting are the centers of galaxies. Some astronomers believe that the possible center of the galaxy is the Black Hole. This is a unique phenomenon formed as a result of the evolution of a star. But so far all these are just theories. Experiments or studies of such phenomena are not yet possible.

In addition to galaxies, there are nebulae in the Universe (consisting of gas, dust and plasma interstellar clouds), relic radiation that permeate the entire space of the Universe, and many other little-known and even generally unknown objects.

The ether circuit of the Universe

Symmetry and balance of material phenomena is main principle structural organization and interaction in nature. Moreover, in all forms: stellar plasma and matter, world and released ethers. The whole essence of such phenomena consists in their interactions and transformations, most of which are represented by the invisible ether. It is also called relic radiation. This is a microwave cosmic background radiation with a temperature of 2.7 K. There is an opinion that it is this vibrating ether that is the primary basis for everything that fills the Universe. The anisotropy of the ether distribution is associated with the directions and intensity of its movement in different areas invisible and visible space. All the difficulty of studying and researching is quite comparable with the difficulties of studying turbulent processes in gases, plasmas and liquids of matter.

Why do many scientists believe that the universe is multidimensional?

After conducting experiments in laboratories and in the Cosmos itself, data were obtained from which it can be assumed that we live in the Universe, in which the location of any object can be characterized by time and three spatial coordinates. Because of this, the assumption arises that the universe is four-dimensional. However, some scientists, developing theories of elementary particles and quantum gravity, may come to the conclusion that the existence a large number measurements are a must. Some models of the Universe do not exclude as many of them as 11 dimensions.

It should be noted that the existence of a multidimensional Universe is possible with high-energy phenomena - black holes, big bangs, busters. At least this is one of the ideas of leading cosmologists.

The expanding universe model is based on general relativity. It was proposed to adequately explain the redshift structure. The expansion began at the same time as the Big Bang. Its state is illustrated by the surface of an inflated rubber ball, on which dots - extragalactic objects - have been applied. When such a balloon is inflated, all its points move away from each other, regardless of position. According to the theory, the universe can either expand infinitely or contract.

Baryon asymmetry of the universe

The observed in the Universe a significant increase in the number of elementary particles over the entire number of antiparticles is called baryon asymmetry. Baryons include neutrons, protons and some other short-lived elementary particles. This imbalance happened in the era of annihilation, namely three seconds after the Big Bang. Up to this point, the number of baryons and antibaryons corresponded to each other. During the mass annihilation of elementary antiparticles and particles, most of them combined into pairs and disappeared, thereby giving rise to electromagnetic radiation.

Age of the Universe on the portal site

Modern scientists believe that our universe is about 16 billion years old. The minimum age is estimated to be 12-15 billion years. The minimum repels from the oldest stars in our Galaxy. Her real age can be determined only with the help of Hubble's law, but real does not mean exact.

Visibility horizon

A sphere with an equal radius of distance that light travels during the entire existence of the Universe is called its visibility horizon. The existence of the horizon is directly proportional to the expansion and contraction of the universe. According to Friedmann's cosmological model, the Universe began to expand from a singular distance about 15-20 billion years ago. For all time, light travels in the expanding Universe the residual distance, namely 109 light years. Because of this, each observer of the moment t0 after the beginning of the expansion process can observe only a small part bounded by a sphere that has a radius I at that moment. Those bodies and objects that are outside this boundary at this moment are, in principle, not observable. The light bounced off them simply does not have time to reach the observer. This is not possible even if the light came out at the beginning of the expansion process.

Due to absorption and scattering in the early Universe, given the high density, photons could not propagate in a free direction. Therefore, the observer is able to record only that radiation that appeared in the era of the Universe transparent to radiation. This era determined by the time t "300,000 years, the density of the substance r" 10-20 g / cm3 and the moment of hydrogen recombination. From the foregoing, it follows that the closer the source is in the galaxy, the greater the redshift value for it.

Big explosion

The moment of origin of the Universe is called the Big Bang. This concept is based on the fact that initially there was a point (singularity point), in which all energy and all matter were present. The basis of the characteristic is considered to be the high density of matter. What happened before this singularity is unknown.

There is no exact information regarding the events and conditions that occurred before the onset of the moment 5 * 10-44 seconds (the moment of the end of the 1st time quantum). In physical terms of that era, one can only assume that then the temperature was about 1.3 * 1032 degrees with a density of matter of about 1096 kg / m 3. These values ​​are the limit for the application of existing ideas. They appear due to the ratio of the gravitational constant, the speed of light, the Boltzmann and Planck constants and are referred to as "Planck".

Those events, which are associated with 5 * 10-44 for 10-36 seconds, reflect the model of the "inflationary Universe". The moment of 10-36 seconds is referred to as the "hot Universe" model.

In the period from 1-3 to 100-120 seconds, helium nuclei and a small number of nuclei of the rest of the lungs were formed chemical elements... From that moment on, the ratio began to be established in the gas - hydrogen 78%, helium 22%. Before one million years, the temperature in the Universe began to drop to 3000-45000 K, the era of recombination began. Previously, free electrons began to combine with light protons and atomic nuclei. Atoms of helium, hydrogen and a small number of lithium atoms began to appear. The substance became transparent, and the radiation that is still observed was disconnected from it.

The next billion years of the existence of the Universe was marked by a decrease in temperature from 3000-45000 K to 300 K. This period for the Universe, scientists called the "Dark Age" due to the fact that no sources of electromagnetic radiation have yet appeared. In the same period, the inhomogeneities of the mixture of the initial gases were compacted due to the effect of gravitational forces... By simulating these processes on a computer, astronomers saw that this irreversibly led to the appearance of giant stars, millions of times larger than the mass of the Sun. Due to such a large mass, these stars heated up to incredibly high temperatures and evolved over a period of tens of millions of years, after which they exploded like supernovae. Heating up to high temperatures, the surfaces of such stars created strong streams of ultraviolet radiation. Thus, the period of reionization began. Plasma, which was formed as a result of such phenomena, began to strongly scatter electromagnetic radiation in its spectral short-wave ranges. In a sense, the universe began to plunge into a thick fog.

These huge stars became the first sources of chemical elements in the Universe, which are much heavier than lithium. Started to form space objects 2nd generation, which contained the nuclei of these atoms. These stars began to form from mixtures of heavy atoms. There was a repeated type of recombination of most of the atoms of intergalactic and interstellar gases, which, in turn, led to a new transparency of space for electromagnetic radiation. The universe has become exactly what we can observe now.

The observable structure of the Universe on the website portal

The observed part is spatially inhomogeneous. Most clusters of galaxies and individual galaxies form its cellular or honeycomb structure. They construct cell walls that are a couple of megaparsec thick. These cells are called "voids". They are characterized by a large size, tens of megaparsecs, and at the same time there is no substance with electromagnetic radiation in them. About 50% of the total volume of the Universe falls to the share of "voids".

The diameter of the Moon is 3000 km, the Earth is 12800 km, the Sun is 1.4 million kilometers, while the distance from the Sun to the Earth is 150 million km. The diameter of Jupiter itself big planet our solar system - 150 thousand km. No wonder they say that Jupiter could be a star, in the video next to Jupiter is located working star, its size () is even smaller than Jupiter. By the way, since you touched Jupiter, you may not have heard, but Jupiter does not revolve around the Sun. The fact is that the mass of Jupiter is so great that the center of rotation of Jupiter and the Sun is outside the Sun, thus both the Sun and Jupiter revolve around common center rotation.

Dimensions of the universe

According to some calculations, there are 400 billion stars in our galaxy, which is called the Milky Way. This is far from the largest galaxy; there are more than a trillion stars in neighboring Andromeda.

As pointed out in the video at 4:35, our Milky Way will collide with Andromeda in a few billion years. According to some calculations, using any technologies we know, even improved ones in the future, we will not be able to reach other galaxies, since they are constantly moving away from us. Only teleportation can help us. This is bad news.

The good news is that you and I were born at a good time when scientists see other galaxies and can theorize about the Big Bang and other phenomena. If we were born much later, when all galaxies scattered far from each other, then most likely we would not be able to find out how the universe arose, whether there were other galaxies, whether there was a Big Bang, etc. We would consider that our Milky Way (united by that time with Andromeda) is the only one in the whole space. But we are lucky and we know something. Maybe.

Let's go back to the numbers. Our small Milky Way contains up to 400 billion stars, neighboring Andromeda more than a trillion, and there are more than 100 billion such galaxies in the observable universe. And many of them contain several trillion stars. It may seem incredible that there are so many stars in space, but somehow the Americans took and pointed their mighty Hubble telescope at a completely empty space in our sky. After observing him for several days, they got this picture:

In a completely empty area of ​​our sky, they found 10 thousand galaxies (not stars), each of which contains billions and trillions of stars. This square is in our sky, for scale.

And what is happening outside the observable universe, we do not know. The dimensions of the universe that we see is about 91.5 billion light years. What's next is unknown. Perhaps our entire universe is just a bubble in the seething ocean of the multiverse. In which there may even be other laws of physics at work, for example, Archimedes' law does not work and the sum of the angles is not equal to 360 degrees.

Enjoy. Dimensions of the universe in the video:

The dimensions of the Universe are inconceivably large for us. Everything that surrounds us, and we ourselves, are just grains of this all-encompassing concept. And it itself has not so much astronomical as philosophical subtext.

The philosophical part of the universe includes the entire material world existing in nature, which has no boundaries in time and space. It is represented by various forms and states that matter takes as a result of its development.

The astronomical part of the universe, scientists consider everything that exists: space, matter, time, energy. It also includes planets, stars, and all other possible cosmic bodies. Scientists can only partially comprehend the size of the Universe. And researchers cannot find an exact and capacious definition for it. Perhaps it is equivalent to God or other manifestations of the Supreme Reason.

The scale of the universe

In order to get even a little closer to the answer to the question, what are the dimensions of the Universe, it is necessary to estimate the scales of its individual parts. For a man to go round Earth the task is difficult, but quite feasible. Now imagine that our planet is compared to Saturn, like a coin compared to a basketball. And in relation to the Sun, the Earth generally looks like a small grain.

The entire solar system also does not have a significant extent on the scale of the universe. If we consider the limit of the system, its length is about 120 astronomical units. In this case, for one au. take a distance equal to ~ 150 billion km. Now imagine that the diameter of the entire Milky Way galaxy, of which the Sun and the surrounding planets are a part, is equal to 1 quintillion kilometers. It's a number with 18 zeros. And the very cluster of different celestial bodies contains, according to various estimates, from 2 * 10 11 to 4 * 10 11 stars, most of which are larger than our celestial body.

And the Milky Way is not the only galaxy in all of outer space. In the starry sky of the Earth, with the naked eye, you can see the neighboring star clusters: Andromeda, Large and Small Magellanic Clouds. Distances to them are measured in megaparsecs - in millions of light years. And each of them also stretches over distances unthinkable for the human mind.

All star clusters are grouped into large-scale associations - groups of galaxies. For example, the Milky Way and neighboring formations are part of the Local Group with a diameter of about 1 megaparsec. Imagine, in order for a ray of light to pass it from one end to the other, it will take 3.2 million years.

But this value is not the largest either. Groups of galaxies, in turn, are combined into superclusters or superclusters. These large-scale universe structures contain hundreds and thousands of galactic groups and millions of star formations. So, in the Virgo Supercluster, which includes the Milky Way, there are more than 100 groups of galaxies. The length of this structure is more than 200 million light years and this is only part of the giant Laniakeya formation.

Laniakei's center of gravity is the Great Attractor supercluster, which attracts all other structures of this part of outer space. It can be safely called the center of the Universe, with the proviso that it is only the core of the cosmos we have known. All Laniakeya has a diameter of more than 500 million light years. And, in order to finally realize the scale of the Universe, imagine that this gigantic formation is just that small part of the cosmos that man could survey and imagine.

The visible universe and its dimensions

The visible or Observable Universe is very complex concept... According to the theory of the Soviet geophysicist Fridman, all outer space is now in the stage of expansion. In this case, all of its elements move away from each other at superluminal speed. Relative to the Earth, the visible part of the universal space is that region of boundless space, from where radiation can come to us. In this case, the object itself, emitting the signal, could already acquire superluminal speed distance from our galaxy, but we still register radiation from it.

What is the size of the Visible Universe? The boundary of the observable part of space is the cosmological horizon. All universe structures outside this area emit radiation that does not reach Solar system... However, the exact size of the visible part of the Universe is very difficult to establish due to its constantly accelerating expansion.

If we take our stellar system as the center of the observable part of the cosmos, and the surface of the last scattering of the relic radiation as the cosmological horizon, then this entire sphere in diameter will be 93 billion light years. Its integral structure is the Metagalaxy - a region of outer space accessible for study with modern astronomical instruments. The metagalaxy is homogeneous and isotropic, and researchers are still arguing whether it is the entire Universe or just its small particle. Its length is constantly changing due to the improvement of technologies used by astronomers.

What is space and what are its dimensions

Talking about the size of the Universe, one cannot fail to mention the concept of "space". This term is understood as a part of the universal space, filled with emptiness, lying outside the atmospheres and shells of celestial bodies. Space is not empty or hollow. It is filled with interstellar matter composed of molecules of hydrogen, oxygen, and ionizing and electromagnetic radiation. In addition, there is dark matter, which scientists have been arguing about for several centuries. Many of them hypothesize that this latent mass is the connecting link of outer space.

Modern astronomers, taking our planet as a reference point, distinguish between:

• Near space. For humans, it begins at an altitude of about 19 kilometers. This is the Armstrong line, where water boils at a temperature human body... A person who is at this height without a spacesuit begins to boil saliva and tears. An altitude of only 100 kilometers is considered an international official border, after which outer space begins.
• Near-earth space - is considered as such up to an altitude of about 260 thousand kilometers. This is the height to which the Earth's gravity exceeds that of the Sun. In the range of these heights, our cosmonauts make orbital flights and various satellites fly.
• Interplanetary region. At these heights, or rather, at distances from the Earth, it makes its flight around our planet. These distances were flown only by automatic space stations and NASA astronauts on the moon landing in 1970.
• Interstellar space - the distance from the Earth is measured already in billions of kilometers.
• Intergalactic space, where the distance is about 5 quintillion kilometers. All this is negligible considering the size of the universe.

How big is the world?

After all you've read, it's worth thinking about how huge the world we live in is. Humans are just microbes compared to, let alone galaxies and space. At the same time, the size of the Universe is inconceivable. And it is unlikely that we will ever be able to know him.