How many celestial bodies are there in the Milky Way? How many galaxies are there in the universe

The Milky Way is no stranger to everyone. Especially on summer nights when the air is ***, the starry sky is bright and dazzling, and that is part of the Milky Way. As beautiful as we see the Milky Way with the naked eye, it holds huge secrets.

The Milky Way is so big, and it's not simple to construct. Many stars, various atmospheres, and mixed dust make up the family of the Milky Way. It is dominated by stars, which occupy almost all of the Milky Way and are mainly found in the circle of the Milky Way.

The wings of the Milky Way that we see are the material of the parts it is made of, and the unit of more than 20,000 light-years is what we often call the solar system.

Despite this, the vast galaxy is not a speck of dust in the eyes of the vast universe. As an example, extragalactic galaxies include an infinite number of galaxies, and the number of extragalactic galaxies is enormous. Because extragalactic galaxies include the Milky Way, their composition is similar to that of the Milky Way, as well as nebulae and matter in the starry sky.

The longitudinal velocity of the Andromeda Galaxy is the result of the Doppler effect, but its transverse velocity cannot be directly measured. Although we measured that it was moving towards the Milky Way step by step in ms, we don't know for sure whether the two would eventually collide or become two parallel lines.

We can't get the corresponding lateral velocity accurately, but we can ** its velocity is advancing in ms. This will cause galaxies to collide, and the galaxy disk will miss the collision between the two. People are working with each other to accurately determine the lateral velocity of a star based on its geography.

We may find that our starry sky becomes a whole new horizon when our assumptions happen to collide with each other.

Perhaps the vast and beautiful Milky Way galaxy was canceled on the path of the times, and transformed into countless planets that make up our starry sky. Scientists unveiled the latest findings at the launch. The density and mass of the Milky Way are even greater than scientists could have anticipated.

Astronomers have just discovered that one of the largest objects in the universe is not hidden behind the Milky Way and is moving at a speed of 18,000 kilometers per second.

Kron Coltberg, an astrophysicist at the University of Cape Town in South Africa and one of the discoverers of the study, said it was impossible to believe that such a large structure could appear in that region of space.

Earth's position in the Milky Way.

It's so big, it's been hiding behind the Milky Way, so how could we miss it for so long?

Well, while it may be hard to believe that we missed that large objects, it may be clear to think about where we are in the universe and how big the universe is. The Milky Way galaxy alone is home to more than 100 billion stars, trillions of planets, and incredible clouds of gas and cosmic dust.

Using observational data from various astronomical telescopes, astronomers calculated how fast each galaxy seen above and below the silver disk was moving away from Earth. The results show that they are actually moving together, and there is evidence that there are many galaxies inside that cannot be observed.

The location of the supercluster.

According to experts, the Supercluster of Galaxies Saili is even farther away from Earth, about 800 million light-years, and is moving away from us at a speed of 65 million kilometers per hour, which is 6% of the speed of light. It's amazing to think about the universe, we see superclusters of galaxies 800 million years ago, and now it's not clear how they are.

The Milky Way is the galaxy in which the Solar System is located. It is a disk-shaped star system of more than 200 billion stars, thousands of star clusters and nebulae, with a diameter of about 100,000 light-years and a thickness of about 6,000 light-years at the center.

This judgment is credible for now. Because from the perspective of the universe, 100 million years is only a very short time, and the birth, growth and even ** of a planet will take at least billions of years.

Although the stars we see today in the Milky Way are often decades or even hundreds of thousands of years ago, the evolution of most stars is negligible.

Moreover, only a very small number of these stars in the Milky Way that we see today are from the later stages of life, that is, the red giant stage, which are more common in the star clusters at the center of the Milky Way. But even then, it's unlikely that these red giants will disappear in hundreds of thousands of years.

In short, for the universe, the Milky Way we see now is not very different from what it actually is.

We simply don't know that for example, the distance from the center of the Milky Way to our solar system is 10,000 light-years, so we will not be able to observe the current state of the silver heart until 10,000 years later, and we have no way to know the dead and newborn stars or planets, after all, our technological level is still too limited, and we can't even know the situation of the sun within 8 minutes on the earth, and the sun we see is from before this time.

Additional information about the landlord: I think the result given by the 3rd floor is right. First of all, the resolution of telescopes and CCDs is definitely not enough, and secondly, many celestial bodies behind gas clouds cannot be observed.

The results of this data estimation are summarized and calculated by summarizing different observational data (if so, is it counted?). ）

Galaxies are relatively stable systems, especially since there are no large companion galaxies near the Milky Way; And 100,000 years is quite short for a star, especially for the vast majority of small-mass stars, it is simply a blink of an eye, so this value can be considered constant during this time.

The relationship between galaxies from large to small, there are countless galaxies like the Milky Way in the universe (extragalactic galaxies), there are countless galaxies like the Milky Way galaxy, and there are several galaxies like the Earth-Moon system in the solar system!

You'll never know what the Milky Way looks like now, because the speed we can see with a telescope is the speed of light, and it can't be any faster!! The radio telescope of the LS is also observed through radio waves, which is also equal to the speed of light!!

Countless. It is impossible to calculate accurately with current scientific knowledge.

That big galaxy is very small in 6,000 to 100,000 years ...

The radio telescope is the current situation, while the optical telescope such as Hubble is the previous situation.

There is only one galaxy in the universe, but there are hundreds of billions of galaxies similar to the Milky Way, and each galaxy has several or dozens of planets like the Earth and countless comets and meteorites, which live in the form of matter according to objective laws.

The Milky Way is a giant barred spiral galaxy, belonging to a kind of spiral galaxy, elliptical disk-shaped, with a huge disk structure, the Milky Way has a total of 4 spiral arms, two main spiral arms and two unformed spiral arms, the spiral arms are 4500 light-years apart, the sun is located on the Orion arm, a branch arm of the Milky Way, and the distance to the galactic center is about 10,000 light-years.

There is only 1 solar system in the Milky Way. The Milky Way is the star system in which the solar system is located, including 1500 400 billion stars and a large number of star clusters, nebulae, as well as various types of interstellar gas and interstellar dust, black holes, and its total visible mass is 210 billion times the mass of the Sun.

The main part of the Milky Way's matter makes up a thin disk called a silver disk. The almost spherical part of the central bulge of the silver disk is called the nuclear sphere, and the stars are highly dense in the nuclear sphere region.

There is a small dense zone in the center of the nuclear sphere called the silver nucleus. Outside the silver disc is a larger, nearly spherical region in which the density of matter is much lower than in the silver disk, called the silver halo. There is also a silver crown on the outside of the silver halo, and its material distribution is also roughly spherical.

Milky WayThere are about 200 billion suns.

The Milky Way, with a total mass of about a trillion times that of the Sun, belongs to the local group of galaxies, and the nearest extragalactic galaxy is the Dwarf Canis Major galaxy 10,000 light-years away.

The Milky Way is an oblate sphere with a massive disk structure consisting of a bright and dense core, two major spiral arms, and two unformed spiral arms, which are 4,500 light-years apart. The Sun is located on one of the Milky Way's arms, the Orion Arm, to the heart of the silver.

The distance is about 10,000 light-years.

The solar system is a collection of celestial bodies centered on the Sun and subject to the Sun's gravitational constraints. Including the eight planets.

In order from near to far from the Sun: Mercury.

Venus, Earth, Mars, Jupiter.

Saturn, Uranus, Neptune), and at least 173 known moons, five identified dwarf planets, including four Kuiper Belt objects, and hundreds of millions of small bodies in the solar system, and comets.

Broadly speaking, the realm of the solar system includes the Sun, four inner planets like Earth, and an asteroid belt made up of many asteroids.

Four huge outer planets made of gas and small celestial bodies filled with small frozen rocks known as the Kuiper Belt. Among them, there are currently eight planets in the solar system, namely Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

The center of the Milky Way is a huge black hole, the light we can see with the naked eye, are composed of stars revolving around the center, scientists estimate that there are 200 billion, equivalent to 200 billion solar systems, its mass, is only the skin of the Milky Way, 200 billion solar systems are only equivalent to the dust of the Milky Way or [electron star]. The huge mass is in the center, and science has observed that black holes can swallow countless solar systems, and even light cannot escape, with extremely high density and amazing mass. Comparing the nuclei of atoms, it is conceivable that the central mass of the Milky Way may also be more than 99% of the entire Milky Way.

So, let's just say that the celestial bodies revolving around the center of the Milky Way are equivalent to 200 billion solar systems.

Solar system. <>

Milky Way<>

Black hole. The black hole at the center of the Milky Way galaxy is not yet explorable and should never be explored, referring to the observed black hole conjecture.

There are at least 100 billion galaxies the size of the Milky Way in the universe. And the Milky Way itself has 200 billion solar systems.

There is one sun in the Milky Way, the sun is a star close to the earth, the sun is the only star that can provide light energy and heat to the earth, if it is a celestial body like the sun, there are hundreds of billions, the sun is the center of gravity in the solar system, and the current life span of the sun is 100 million years.

There is one sun in the Milky Way, which is the closest star to the Earth, constantly providing light energy and heat to the Earth, but there are hundreds of billions of celestial bodies like the Sun. The Sun is the central celestial body in the solar system, which occupies the total mass of the solar system, and the eight planets all revolve around the sun.

The Sun is a star at the center of the Solar System, orbiting the center of the Milky Way, and the current life span of the Sun is about 100 million years, and after about 506 billion years, the hydrogen element in the Sun's interior will be almost completely depleted.

Different stars have different lifespans, the smaller their mass, the slower the fusion reaction, but the longer they burn, they can live up to 10 billion years for planets with a similar mass to the Sun, and hundreds of billions of years for planets with only one-tenth the mass of the Sun.

Milky WayThe center is the galactic center, which is the intersection of the galaxy's axis of rotation and the galactic plane. It is the center of the silver nucleus and the center of the Milky Way. The Silver Heart is located in the constellation Sagittarius.

Direction. This region is mostly made up of massive stars. The mass of the silver core is about 4 million times the mass of the sun. Some people think that the galactic region is a massive dense nucleus, perhaps a massive black hole.

The silver core is a slightly raised part of the Milky Way**. It is a very bright spherical body, about 20,000 light-years in diameter and 10,000 light-years thick. This region is made up of a high density of stars and interstellar matter.

Among them are mainly old red stars that are about 10 billion years old. The activity of the silver core is very intense.

Milky Way

How many galaxies are there in the Milky Way?

The total mass of the Milky Way is about 100 billion solar masses, and if the average mass of stars is similar to that of the Sun, there are about 100 billion stars in the Milky Way. In fact, the number of dwarf stars with masses smaller than the Sun in the Milky Way far exceeds those with masses greater than the Sun, so the total number of stars in the Milky Way is estimated to be about 1500-200 billion.

However, not all of these 200 billion or so stars have their own planetary systems, that is, many stars do not have their own galaxies, such as the following:

Binary, concentrating: If a binary star or cluster star is in close proximity to the other star, it will almost certainly not have a planetary system, because the strong stellar gravitational pull can change the orbit of the planet, causing the planet to fly outside the star system or fall into the star. Of course, if the binary star is farther away, or if one of the stars is farther away from the center of the cluster, it may still have its own star system.

Nebulous stars, infrared stars: These stars are still in the "embryonic" stage of stars, and the stars in the nebula disk have not yet converged and formed, so they cannot be called star systems.

Eruptive Variables: Even if they are not supernovae eruptions, these variable stars emit enough energy to destroy all the planets around them.

Stars near the center of the Milky Way: Due to the gravitational pull of the center of the Milky Way, it is difficult to maintain their own planetary system.

In general, it is currently possible by default to have planets and make up star systems with stars as the main sequence stars. Among them, F-type and G-type stars are the focus of astronomical research, because F-type and G-type stars are similar to the Sun, and if they have a planetary system, life may appear.