Cold celestial bodies radiating. The moon is a solid, cold celestial body that does not emit its own light, it shines in the sky only because it reflects the light of the Sun with its surface

Astronomy is a science that deals with the study of celestial objects. Considers stars, comets, planets, galaxies, and also does not disregard existing phenomena occurring outside the Earth's atmosphere, for example,

By studying astronomy, you can get an answer to the question “Celestial bodies that glow themselves. What it is?".

Bodies of the solar system

To find out if there are those that glow themselves, you first need to understand what celestial bodies the solar system consists of.

The solar system is a planetary system, in the center of which is a star - the Sun, and around it are 8 planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. In order for a celestial body to be called a planet, it must meet the following requirements:

  • Make rotational movements around the star.
  • To have a shape in the form of a sphere, due to sufficient gravity.
  • Do not have other large bodies around its orbit.
  • Don't be a star.

The planets do not emit light, they can only reflect the rays of the Sun that hit them. Therefore, it cannot be said that the planets are celestial bodies that glow themselves. Stars are such celestial bodies.

The sun is the source of light on earth

The celestial bodies that glow themselves are the stars. The closest star to Earth is the Sun. Thanks to its light and warmth, all living things can exist and develop. The sun is the center around which the planets, their satellites, asteroids, comets, meteorites and cosmic dust revolve.

The sun appears to be a solid spherical object, because when you look at it, its contours look quite distinct. However, it does not have a solid structure and consists of gases, the main among which is hydrogen, and other elements are also present.

To see that the Sun does not have clear contours, you need to look at it during an eclipse. Then you can see that it is surrounded by a driving atmosphere, which is several times larger than its diameter. With normal glare, this halo is not visible because of the bright light. Thus, the Sun has no exact boundaries and is in a gaseous state.

Stars

The number of existing stars is unknown, they are located at a great distance from the Earth and are visible as small dots. Stars are celestial bodies that glow on their own. What does this mean?

Stars are hot balls, consisting of gas, in which their surfaces have different temperatures and densities. The size of the stars also differ from each other, while they are larger and more massive than the planets. There are stars that are larger than the Sun, and vice versa.

A star is made up of gas, mostly hydrogen. On its surface, from high temperature, the hydrogen molecule breaks up into two atoms. An atom is made up of a proton and an electron. However, under the influence of high temperatures, atoms "release" their electrons, resulting in a gas called plasma. An atom without an electron is called a nucleus.

How stars emit light

The star, at the expense of trying to compress itself, as a result of which the temperature in its central part rises greatly. Begin to occur as a result of the formation of helium with a new nucleus, which consists of two protons and two neutrons. As a result of the formation of a new nucleus, a large amount of energy is released. Particles-photons are emitted as an excess of energy - they also carry light. This light exerts a strong pressure that emanates from the center of the star, resulting in an equilibrium between the pressure emanating from the center and the gravitational force.

Thus, the celestial bodies that glow themselves, namely the stars, glow due to the release of energy during nuclear reactions. This energy is used to contain gravitational forces and to emit light. The more massive the star, the more energy is released and the brighter the star shines.

Comets

The comet consists of an ice clot, in which gases and dust are present. Its core does not emit light, however, when approaching the Sun, the core begins to melt and particles of dust, dirt, gases are thrown into outer space. They form a kind of foggy cloud around the comet, which is called a coma.

It cannot be said that a comet is a celestial body that itself glows. The main light it emits is reflected sunlight. Being far from the Sun, the light of the comet is not visible, and only approaching and receiving the sun's rays, it becomes visible. The comet itself emits a small amount of light, due to the atoms and molecules of the coma, which release the quanta of sunlight they receive. The "tail" of a comet is "scattering dust", which is illuminated by the Sun.

meteorites

Under the influence of gravity, solid objects called meteorites can fall to the surface of the planet. They do not burn up in the atmosphere, but when passing through it, they become very hot and begin to emit a bright light. Such a luminous meteorite is called a meteor.

Under the pressure of air, a meteor can break into many small pieces. Although it gets very hot, the inside of it usually remains cold, because in such a short time that it falls, it does not have time to heat up completely.

It can be concluded that the celestial bodies that glow themselves are stars. Only they are capable of emitting light due to their structure and the processes occurring inside. Conventionally, we can say that a meteorite is a celestial body that itself glows, but this becomes possible only when it enters the atmosphere.

The moon is a solid, cold celestial body that does not emit its own light, it shines in the sky only because it reflects the light of the Sun with its surface. Turning around the Earth, the Moon turns to it either as a fully illuminated surface, or as a partially illuminated surface, or as a dark one. That is why the appearance of the Moon is constantly changing during the month.










In its second phase - the first quarter. It was the tenth lunar day. We watched the growing young moon. This phase lasted until March 7, when the illuminated part of the Moon reached its maximum size. During the month of March, three girls from our team watched the moon and saw that its appearance was changing every day. On March 1, the moon entered






As a result of attempts to coordinate the calendar month with the phases of the moon, people created the lunar calendar - the most ancient time counting system. The main disadvantage of the lunar calendar is the difficulty of reconciling it with the seasons, the duration of which is determined by the length of the tropical year, which is 365 days.


The origin of the seven-day week, which is an intermediate unit between the month and the day for measuring time and approximately the corresponding quarter of the lunar synodic month, is also associated with the phases of the moon. People noticed that each phase of the moon lasts about seven days, and therefore they divided the lunar month into four weeks, each lasting seven days. seven day week


With the development of astrology, the days of the week, which began at that time on Saturday, were given the names of the seven celestial "wandering" bodies: for example, they called Saturday the day of Saturn, Monday - the day of the Moon, Tuesday - the day of Mars, Wednesday - the day of Mercury, Thursday - the day Jupiter, Friday - the day of Venus and Sunday - the day of the Sun. Most of these names of the days of the week have survived to this day in a number of languages ​​​​of European countries (French, Italian, English, German, etc.)

To find out if there are celestial bodies that glow themselves, you first need to understand what celestial bodies the solar system consists of. The solar system is a planetary system, in the center of which is a star - the Sun, and around it are 8 planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. In order for a celestial body to be called a planet, it must meet the following requirements
Make rotational movements around the star.
To have a shape in the form of a sphere, due to sufficient gravity.
Do not have other large bodies around its orbit.
Don't be a star.

The planets do not emit light, they can only reflect the rays of the Sun that hit them. Therefore, it cannot be said that the planets are celestial bodies that glow on their own. Stars are such celestial bodies. The sun is the source of light on Earth The celestial bodies that glow themselves are the stars. The closest star to Earth is the Sun. Thanks to its light and warmth, all living things can exist and develop. The sun is the center around which the planets, their satellites, asteroids, comets, meteorites and cosmic dust revolve.

The sun appears to be a solid spherical object, because when you look at it, its contours look quite distinct. However, it does not have a solid structure and consists of gases, the main among which is hydrogen, and other elements are also present.

To see that the Sun does not have clear contours, you need to look at it during an eclipse. Then you can see that it is surrounded by a driving atmosphere, which is several times larger than its diameter. With normal glare, this halo is not visible because of the bright light. Thus, the Sun has no exact boundaries and is in a gaseous state. Stars The number of existing stars is unknown, they are located at a great distance from the Earth and are visible as small dots. Stars are celestial bodies that glow on their own. What does this mean? Stars are hot balls of gas in which thermonuclear reactions take place. Their surfaces have different temperatures and densities. The size of the stars also differ from each other, while they are larger and more massive than the planets. There are stars that are larger than the Sun, and vice versa.

A star is made up of gas, mostly hydrogen. On its surface, from high temperature, the hydrogen molecule breaks up into two atoms. An atom is made up of a proton and an electron. However, under the influence of high temperatures, atoms “release” their electrons, resulting in a gas called plasma. An atom without an electron is called a nucleus. How stars emit light A star, due to the gravitational force, tries to compress itself, as a result of which the temperature in its central part rises strongly. Nuclear reactions begin to occur, as a result, helium is formed with a new nucleus, which consists of two protons and two neutrons. As a result of the formation of a new nucleus, a large amount of energy is released. Particles-photons are emitted as an excess of energy - they also carry light. This light exerts a strong pressure that emanates from the center of the star, resulting in an equilibrium between the pressure emanating from the center and the gravitational force.

Thus, the celestial bodies that glow themselves, namely the stars, glow due to the release of energy during nuclear reactions. This energy is used to contain gravitational forces and to emit light. The more massive the star, the more energy is released and the brighter the star shines. Comets A comet consists of an ice clot in which gases and dust are present. Its core does not emit light, however, when approaching the Sun, the core begins to melt and particles of dust, dirt, gases are thrown into outer space. They form a kind of foggy cloud around the comet, which is called a coma.

It cannot be said that a comet is a celestial body that itself glows. The main light it emits is reflected sunlight. Being far from the Sun, the light of the comet is not visible, and only approaching and receiving the sun's rays, it becomes visible. The comet itself emits a small amount of light, due to the atoms and molecules of the coma, which release the quanta of sunlight they receive. The "tail" of a comet is "scattering dust", which is illuminated by the Sun. Meteorites Under the influence of gravity, solid cosmic bodies called meteorites can fall to the surface of the planet. They do not burn up in the atmosphere, but when passing through it, they become very hot and begin to emit a bright light. Such a luminous meteorite is called a meteor. Under the pressure of air, a meteor can break into many small pieces. Although it gets very hot, the inside of it usually remains cold, because in such a short time that it falls, it does not have time to heat up completely. It can be concluded that the celestial bodies that glow themselves are stars. Only they are capable of emitting light due to their structure and the processes occurring inside. Conventionally, we can say that a meteorite is a celestial body that itself glows, but this becomes possible only when it enters the atmosphere.

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Goals:

  • Introduce students to the solar system.
  • Give the concept of a cosmic body, stars, planets
  • Get to know the planets of the solar system

During the classes:

1. The topic of today's lesson: "We are the inhabitants of the Universe"

And who has heard the word "universe"?

And what does it mean?

The Universe (cosmos) is our entire vast world, the entire world around us, including what is outside the Earth - outer space, planets, stars.

Since ancient times, people have been interested in the secrets of the sky, especially at night. Many thousands of years ago, the ancient Greeks called a huge number of stars space - a huge world outside the Earth.

Ancient people believed that the stars and planets were the eyes of gods and heroes living in the sky. A defenseless man was afraid of everything: thunderstorms, lightning, drought, storms. The man did not understand why all this was happening. He thought that the gods controlled the phenomena of nature.

(slide 4.5)

Centuries have passed. Mankind has invented telescopes. Looking at the starry sky, scientists realized that the stars and planets are different celestial bodies. What is their difference?

Stars are huge hot celestial bodies that emit light.

The closest star to us is the Sun.

But if you compare the Sun with other stars in our universe, you can see how small it is, and how huge the stars are.

In addition to stars, there are also planets in the Universe. Planets are cold celestial bodies that do not emit their own light. One of the planets Earth.

Planets revolve around the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.

(slide 11-12)

See what the Earth looks like compared to other planets in the solar system.

(slide 13-22)

The teacher briefly tells interesting facts about the planets of the solar system.

An astronomical rhyme will help us remember the location of the planets of the solar system.

An astrologer lived on the moon
He counted the planets:
Mercury - times
Venus - two-s,
Three - Earth,
Four - Mars,
Five - Jupiter,
Six - Saturn,
Seven - Uranus,
Eighth - Neptune,
Nine - farthest - Pluto ...
Who does not see - get out!

(children learn the counting rhyme)

In addition to stars and planets, the solar system includes asteroids and comets.

2. Lesson summary.

  • What new did you learn in the lesson?
  • Let's test ourselves and answer the questions.

Cosmos (from the Greek Hosmos - the world) is a term that arose in ancient Greek philosophy to designate the world as a structurally organized and ordered whole.

Now space is understood as everything that is outside the Earth's atmosphere.

Otherwise, space is called the Universe - the place of human settlement.

The Universe is the world around us, infinite in space, in time and in the variety of forms of the substance that fills it and its transformations.

The universe is a mega world.

Studying the universe as a whole astronomy.

Astronomy - the science of the movement, structure, origin, development of celestial bodies, their systems and the universe as a whole.

The main method of obtaining astronomical knowledge is observation.

Modern astronomy includes several scientific disciplines - astrophysics, astrochemistry, radio astronomy, cosmology, cosmogony.

Cosmology - the field of science in which the Universe as a whole and space systems as its parts are studied.

Cosmogony- a branch of astronomy that studies the origin of space objects and systems.

The difference between cosmology and cosmogony lies in the difference in approach to the objects under study: cosmology studies the laws of the entire universe, and cosmogony considers specific cosmic bodies and systems.

The world is united, harmonious and at the same time has a multi-level organization.

The Universe is an ordered system of individual interconnected elements of various orders, which include celestial bodies (stars, planets, satellites, asteroids, comets), planetary systems of stars, star clusters, galaxies.

Stars

planets- cold celestial bodies that revolve around a star.

satellites- cold celestial bodies that revolve around the planets.

solar system(or planetary system) - a set of celestial bodies, their satellites, asteroids, comets, revolving around the Sun under the influence of its gravitational force.

The solar system includes 9 planets, their satellites, over 100 thousand asteroids, many comets.

Four smaller inner planets Mercury, Venus, Earth and Mars (called the terrestrial planets) are composed primarily of silicates and metals.

Four outer planets Jupiter, Saturn, Uranus and Neptune (called the gas giants) are much more massive than the terrestrial planets.

The largest planets in the solar system, Jupiter and Saturn, are composed mainly of hydrogen and helium; the outer, smaller Uranus and Neptune, in addition to hydrogen and helium, contain methane and carbon monoxide in their atmospheres.

Such planets stand out in a separate class of "ice giants".

6 planets out of eight and three dwarf planets have natural satellites. Each of the outer planets is surrounded by rings of dust and other particles.

There are two regions in the solar system filled with small bodies. The asteroid belt, located between Mars and Jupiter, is similar in composition to the terrestrial planets, since it consists of silicates and metals. The largest objects in the asteroid belt are the dwarf planet Ceres and the asteroids Pallas, Vesta, and Hygiea.

Beyond the orbit of Neptune are trans-Neptunian objects, consisting of frozen water, ammonia and methane, the largest of which are Pluto, Sedna, Haumea, Makemake, Quakar, Orcus and Eris. There are other populations of small bodies in the solar system, such as planetary quasi-satellites and Trojans, near-Earth asteroids, centaurs, damocloids, as well as comets, meteoroids and cosmic dust moving through the system.

The solar wind (a stream of plasma from the Sun) creates a bubble in the interstellar medium called the heliosphere that extends to the edge of the scattered disk. The hypothetical Oort cloud, which is the source of long-period comets, can extend to a distance of about a thousand times beyond the heliosphere.

The solar system is part of the Milky Way galaxy

asteroids(or minor planets) - small cold celestial bodies that make up the solar system. They have a diameter of 800 km to 1 km or less, they revolve around the Sun according to the same laws that large planets move.

Comets - celestial bodies that make up the solar system. They look like hazy spots with a bright clot in the center - the core. Comet nuclei are small - a few kilometers. In bright comets, when approaching the Sun, a tail appears in the form of a luminous strip, the length of which can reach tens of millions of kilometers.

Galaxy- a giant star system with more than 100 billion stars revolving around its center. Star clusters are marked inside the galaxy. star clusters- groups of stars separated by a smaller distance than the usual interstellar distances.

Galaxies form a metagalaxy.

Metagalaxy - a grandiose collection of individual galaxies and clusters of galaxies.

In the modern interpretation, the concepts of "metagalaxy" and "Universe" are often identified.

When studying the objects of the Universe, one deals with with very long distances.

For convenience, when measuring such super-large distances, special units are used in cosmology:

1. Astronomical unit(au) corresponds to the distance from the Earth to the Sun - 150 million km. This unit is used to determine cosmic distances within the solar system.

2. Light year- the distance that a light beam moving at a speed of 300,000 km / s travels in one year is approximately 1013 km; 1 a.u. equals 8.3 light minutes. In light years, determine the distance to stars and other space objects located outside the solar system.

3. Parsec (pc)- a distance equal to 3.3 light years. Used to measure distances within and between star systems.

1 Kpc (kiloparsec) = 103pc, 1 Mpc (megaparsec) = 106pc.

The first astronomical knowledge was obtained by the thinkers of the Ancient East - Egypt, Babylonia, India, China.

Astronomers of the ancient world learned to predict the onset of eclipses, followed the movement of the planets. This astronomical knowledge, accumulated as early as the 7th-6th centuries. BC, borrowed by the ancient Greeks.

THE IDEA of the geocentric structure of the Universe.

In the VI century BC. scientist and philosopher of ancient Greece Aristotle actually came up with the idea geocentric structure of the universe.

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Related information:

Site search:

Number the celestial bodies in descending order of their size.

Emphasize those that radiate their own light.

Answers:

An asteroid is a celestial brow of a small size, usually stony, of irregular shape. It makes revolution around the Sun. The main part of asteroids is localized in the belt between the orbits of Mars and Jupiter. An astronomical unit is a unit of distance in astronomy. Equal to the average distance of the Earth from the Sun. That is, 1 a.u. = 149,600,000 km. Aphelion is the point in the orbit of a celestial body that is farthest from the Sun. A white dwarf is a very small star at the final stage of evolution, its characteristic feature is a very high density. Big Bang - the most powerful explosion, which (there is such a hypothesis) marked the beginning of the evolution of the Universe. Scientists believe that it happened about 15 billion years ago! Rotation is the movement of a body around its axis in a certain direction.

General ideas about the Universe

Universe is an ordered system of interconnected elements of various orders. These are: celestial bodies (stars, planets, satellites, asteroids, comets), planetary systems of stars, star clusters, galaxies.

Stars- giant hot self-luminous celestial bodies.

planets- cold celestial bodies that revolve around the stars.

satellites(planets) - cold celestial bodies that revolve around the planets.

asteroids(minor planets) - small cold celestial bodies that are part of the solar system. They have a diameter of 800 to 1 km and revolve around the Sun according to the same laws that large planets move. There are over 100 thousand asteroids in the solar system.

Comets are the celestial bodies that make up the solar system. They look like hazy spots with a bright clot in the center - the core. Comet nuclei are small - a few kilometers. In bright comets, when approaching the Sun, a tail appears in the form of a luminous strip, the length of which can reach tens of millions of kilometers.

Galaxy- a giant star system with more than 100 billion stars revolving around its center. The galaxy is formed by stars and the interstellar medium.

Metagalaxy- a grandiose collection of individual galaxies and clusters of galaxies.

In addition to galaxies, the Universe contains relic electromagnetic radiation, a small amount of very rarefied intergalactic matter, and an unknown amount of substance, which is called hidden mass and latent energy.

When studying objects in outer space, one has to deal with very large distances, which in astronomy are usually expressed in special units.

astronomical unit(AU) corresponds to the distance from the Earth to the Sun. 1 a.u. = 149.6 million km. This unit is used to determine cosmic distances within the solar system. For example, the distance from the Sun to Pluto is 40 AU.

Light year (s.y.)- the distance that a light beam moving at a speed of 300,000 km / s travels in one year. 1 s. g. = 10 13 km; 1 a.u. = 8.3 light minutes. In light years, determine the distance to stars and other space objects outside the solar system.

Parsec(pc) - a distance equal to 3.3 light years. 1 pc \u003d 3.3 s.g. This unit is used to measure distances within and between star systems.

Stars. The most common objects in the universe are stars. Stars are hot cosmic objects, consisting of ionized gas. In the depths of stars, thermonuclear reactions of the conversion of hydrogen into helium take place, as a result of which huge energy is released. From 97 to 99.9% of the matter of galaxies is concentrated in stars. It is assumed that the total number of stars in the universe is about 10 22, of which we can observe only 2 billion.

Stars have different sizes - supergiants, their sizes are hundreds of times larger than the Sun, and dwarfs, their sizes are even smaller than the Earth. Our Sun is a medium sized star. The closest star to the Sun, Alpha Centauri, is 4 light years away. It is assumed that most stars have their own planetary systems, similar to the sun.

Stars can form star systems - several stars revolving around a common center; star clusters - hundreds - millions of stars; galaxies are billions of stars.

Depending on whether the star changes its characteristics or not, stationary and non-stationary (variable) stars are distinguished. The stationarity of the star is ensured by the balance between the pressure of the gas inside the star and the forces of gravity. Non-stationary include new and supernova stars on which flares occur.

The formation and disappearance of stars is a constant process. Stars are formed from cosmic matter as a result of its condensation under the influence of gravitational, magnetic and other forces. The gravitational contraction heats up the central part of the young star and "starts" the thermonuclear reaction of helium fusion from hydrogen. When the nuclear reaction fails to sustain stability, the helium core contracts and the outer shell expands and is ejected into outer space. The star turns into red giant. The color of the star changes from yellow to red. For example, the Sun will become a red giant in about 8 billion years.

If the star has a small mass (less than 1.4 solar masses), then in the process of further cooling it turns into a white dwarf. White dwarfs represent the final stage in the evolution of most stars, in which all hydrogen "burns out" and nuclear reactions cease. Gradually, the star turns into a cold dark body - black dwarf. The size of such dead stars is comparable to the size of the Earth, the mass - with the mass of the Sun, and the density is hundreds of tons per cubic centimeter.

If the star's mass is greater than 1.4 solar masses, then such a star cannot go into a stationary state, since the internal pressure does not balance the gravitational forces. As a result, a gravitational collapse occurs, i.e. an unlimited fall of matter towards the center, which is accompanied by an explosion and the release of a huge amount of matter and energy. Such an explosion is called supernova explosion. It is believed that since the formation of our galaxy, about a billion supernovae have erupted in it.

The star explodes in the form of a supernova and turns into a black hole. Black hole(BH) is an object that has such a strong gravitational field that it does not release anything (including radiation) from itself. Inside a black hole, space is highly curved and time is infinitely slow. In order to overcome the gravity of a black hole, it is necessary to develop a speed greater than the speed of light.

Despite the fact that the black hole does not emit any radiation, it can be detected, since the gravitational field near the surface of the black hole emits particles of different types. It is assumed that BHs are located at the centers of some galaxies. So in the center of our galaxy there is a strong source of radiation - Sagittarius A. It is believed that Sagittarius A is a black hole with a mass equal to a million solar masses.

There was an assumption that black holes can be areas of transition from one space to another space, to another Universe, which differs from ours in physical properties and has other physical constants.

Part of the mass of the exploded supernova may continue to exist in the form neutron star or pulsar. Neutron stars are bunches of neutrons. They quickly cool down, they are characterized by intense radiation in the form of repetitive pulses.

Stars with a mass between 10 and 40 solar masses turn into neutron stars, and stars with a mass greater than that turn into black holes.

Galaxies. Galaxies are giant collections of stars, dust and gas. Galaxies exist as groups (a few galaxies), clusters (hundreds of galaxies), and clouds of clusters or superclusters (thousands of galaxies). The most studied is the Local Group of galaxies. It includes our galaxy (the Milky Way) and the galaxies closest to us (the nebula in the constellation Andromeda and the Magellanic Clouds).

Galaxies differ in size, number of stars included in them, luminosity, appearance. According to their appearance, galaxies are conditionally divided into three main types: elliptical, spiral and irregular.

At the initial stage of formation, galaxies have an irregular shape. Spiral galaxies develop from them, having a clearly expressed form of rotation. And finally, at the third stage, elliptical galaxies appear, having a spheroidal shape.

Our Milky Way galaxy is a spiral galaxy. This is the most common type of galaxy. It has the shape of a disk with a bulge in the center - the core, from which spiral arms extend. The disk rotates around the center.

The diameter of our galaxy is 100 thousand light years, the diameter of the core is 4 thousand light years, the total mass of the galaxy is about 150 billion solar masses, the age is about 15 billion years.

The space between galaxies is filled with interstellar gas, dust and radiation of various kinds. It is believed that interstellar gas consists of 67% hydrogen, 28% helium, and 5% other elements (oxygen, carbon, nitrogen, etc.).

A metagalaxy is an observable part of the universe. Modern observational capabilities are distances of 1500 Mpc. A metagalaxy is an ordered system of galaxies.

Modern astronomical data indicate that the Metagalaxy has a grid (cellular) structure, i.e. galaxies are distributed in it not evenly, but along certain lines - as if along the boundaries of the cells of the grid.

In 1929, the American astronomer Edwin Hubble experimentally established the fact that the system of galaxies is not static, but expands, “runs away”. This means that the Universe is non-stationary, it is in a state of constant expansion. Based on this, a law was formulated (Hubble's law): the farther the galaxies are separated from each other, the faster they "scatter". This means that for any pair of Galaxies, the speed of their removal from each other is proportional to the distance between them:

, where

V- the speed of the recession of galaxies, R- distance between galaxies, H - coefficient of proportionality, which is called the Hubble constant (parameter).

The current average value of the Hubble constant is H = 74.2 ± 3.6 km/s per Mpc (megaparsec). Estimation of the value of the Hubble constant allows us to estimate the age of the Universe (Metagalaxy).

The concept of the non-stationarity of the Universe was first introduced by A. A. Fridman even before the experimental proof of the phenomenon of "recession" of galaxies. Distances to galaxies are measured in millions and billions of light years. This means that we see them not as they are now, but as they were millions and billions of years ago. In essence, we see past epochs of the Universe.

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star

celestial body (hot gas ball)

Alternative descriptions

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Heavenly body

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City figure

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. "burn, burn, my..."

Bethlehem …

Zh. one of the luminous (self-luminous) celestial bodies visible on a cloudless night. So it starred, and the stars appeared. The likeness of a heavenly star, a radiant image, written or made of something. Five-, six-, arched or coal star. The same decoration, favored with orders of higher degrees. A white spot on the forehead of a horse, cow. Merin bay, a star on the forehead. right ear pierced. * Happiness or luck, ta lan. My star has gone down, happiness has perished. A fixed star that does not change its position or place in the sky, and is taken by us for the sun of other worlds; these stars form permanent constellations for us. Blue (broad) star, which, without flickering, turns, like our earth, around the sun; planet. A star with a tail or with a tail, with a fan, a comet. Morning, evening star, dawn, one and the same planet Venus. Polaris is the closest large star to the north pole. Starfish or chickweed, one of the various star-like marine animals in sketch. Star girl, lively. Cavalier star, plant. Passiflora. Do not count the stars, but look at your feet: you will not find anything, so at least you will not fall. Forgive (hidden), my star, my red sun! Ships sail on the stars. Catches stars in the water with a sieve. Starry night on Epiphany, harvest for peas and berries. Frequent stars, chalk stars, crumbly. Under a happy (or not happy) star (or planet, planid) was born. The star falls to the wind. on which side the star falls on Christmas time, the groom is on that side. Bright baptismal stars will give birth to white brights. Do not look at the shooting stars on Leo of Catania, Feb. Whoever falls ill on this day will die. On Tryphon February) starry late spring. Warm evening on Jacob April) and starry night, to the harvest. On Andronicus in October) they tell fortunes by the stars about the weather, the harvest. Did the peas scatter all over Moscow, all over Vologda? stars. Is the entire path strewn with peas? stars on the sky. Star with a tail, to war. Asterisk, asterisk, asterisk, asterisk, -night, zap. asterisk, diminish. Starry, gazing towards the heavens. Starry sky. Star shine. Star, to a star, in meaning. orders or images related. Star Master. Star wheel, in cars, frontal, in which fists or teeth are planted along the edge, opposite. comb. Star, star, to stars, in decomp. value related. Star moss, Mnium mossy plant. Star grass, Alchemilla, see love spell. Star-shaped, with a star or star-shaped, star-shaped, star-like. Star curtain. Star decoration. Star horse. Starry or stellar, multi-star, studded with stars. Starryness condition, quality adj. Zvezdnik m. animal starfish, starfish. Asterisk or starfish m. aster, Aster plant and flower. A precious stone with a metallic sheen, in the form of a cross, a star. Starfish is the name of the fossilized shell Siderotes. Stargazer m. stargazer, stargazer or stargazer m. astronomer. Zvezdovshchina astronomy. Zvezdovnik m. painting containing the calculation or names and descriptions of stars and constellations. Zvezdach m. star-bearer, on whom a paid star. Who wears a star on the day of the Nativity of Christ according to folk custom, with congratulations. Starfish, starfish, horse or cow with a star on its forehead. Zvezdysh m. Zvezdovka Astrantia plant. Asterisk Stellaria plant. Asterisk, star plant. Polyp species, Astrea; starfish. Starfish, another species of the same animal. Zvezdina glitter, sparkle, star pattern; a star on a horse's forehead. Star impersonal. be the stars in the sky, oh clear night.

In the yard it's starry. to whom, to speak the harsh truth, without bluntness. he cuts him like that, and stars like that! The sky is starry; the spark is starring in the dark. The sky has starred or has starred in the sky. The star reached the morning, it was clear. stared him straight out. Funny lights lit up. Starred in the sky. Words nazvezdit, but in fact from the spot. Hurt, foreign starred. The clouds pulled, starred. It was starry, but it is rejuvenating again.

The light flashed and disappeared. The Creator starred the sky. The star was a brawler, who, with a blow of his fist, seems to be a star. A straight man who speaks the harsh truth straight to the face. perv. value and star sign. beat; punch someone. Wine zvezdukha, from which stars in the eyes, strong; slap, blow. Stargazer, stargazer m. stargazer, stargazer, stargazer, astronomer. -ny, stellar, related to this science. Stargazer cf. observatory. Stargazing cf. nautical astronomy. Star captain, navigator, piloting a ship according to astronomy reckoning: navigator. 3 zvezdovolhv, - sorcerer, zvezdovorozhka vol. astrologer m. -nitsa w. who guesses, tells fortunes by the stars. Stargazer m. name of the astronomer; skygazer, a person who looks up, but does not see under his feet. Fish Uranoscopus, whose eyes are turned upwards. Astronomy cf. astronomy, zvezdovschina, astronomy. Zvezdozakonnik, astrologer, astronomer. Starry sky, starry. 3 star-belted, girded with a starry band: who has a starry belt. Star-spangled, star-studded, star-scattered. Starfish m. Rhinoster, American. mole, with a stellate growth on the snout. Stargazer comic. astronomer; astrologer. tribute, astrology. Star-decorated, adorned, adorned, adorned with stars. Stargrab m. a arrogant person, an arrogant mind, a know-it-all. Starflower m. plant asterisk, aster. -ny, with star-shaped flowers. Stargazer m. astrologer; -ny, related to astrology. Astronomy cf. astrology, stargazing

Yellow symbol from the Brazilian flag

Celebrity

And the Sun, And Sirius, and Vega

Echinoderm that looks like a regular pentagon

What sign did the Timurovites draw on the gate

Painting by French artist E. Degas

Solitaire card

Cinema in Moscow, Zemlyanoy Val

Cosmic status of Sirius

Naval "combat award"

Marine five-pointed animal

Moscow cinema

On the chest of the hero of the Soviet Union

In the sky and on the stage

American Sheriff name badge

Title of the periodical

Heavenly body

One of the topologies of computer networks

Distinctive badge on shoulder straps

Pentagram as a figure

When it falls, you need to make a wish

When something falls, it is customary to make a wish

The work of G. Wells

The work of E. Kazakevich

Guiding …

The story of the Russian writer V.

Veresaeva

Regulus, Antares

A novel by G. Wells

Novel by American author Danielle Steele

Russian romance

Self-luminous celestial body

Light

Luminary of captivating happiness

Sirius, Vega

The sun as a celestial body

The sun as an object

Lermontov's poem

A poem by the Russian poet A. Koltsov

The third figure in the towns

Ukrainian football club

Kremlin decoration and shoulder straps

Figure in towns

Figure with triangular ledges on a circle

Figure, as well as an object with triangular protrusions around the circumference

A film by Alexander Ivanov

A film by Nikolai Lebedev

Football club from Serpukhov

What shone in the forehead of the narrowed Pushkin Gvidon

Variety luminary

Any one of the myriads in the night sky

. "fell" from the sky into the sea

The nickname of the planet Venus is "Evening ..."

Bob Fosse film "..." Playboy "

Film by Vladimir Grammatikov "... and the death of Joaquin Murieta"

Film by Alexander Mitta "Burn, burn, my..."

The novel of the Russian writer A. R. Belyaev "... KETs"

Opera by composer D. Meyerer "Northern ..."

The world's largest diamond is called the "Big ... Africa"

What sign did the Timurovites draw on the gate?

When something falls, it is customary to make a wish?

The drama of the Spanish playwright Lope de Vega "... Seville"

. "burn, burn, my..."

. "cosmic" name of the sheriff's badge

Naval "combat award"

. "burn, burn, my..." (romance)

Kirkorov - ... Russian stage