How many stars are there in the universe and how many planets are there in the universe

What you want to know is the celestial bodies! Here are some of the findings.

Stars, nebulae, planets, meteors, comets, satellites, and interstellar matter, collectively known as celestial bodies, are forms of matter in the universe. But what exactly is a celestial body? It's still a very vague concept.

The relevant textbook says: "Celestial bodies are objects that exist outside the earth's atmosphere that are observed in the sky, such as stars, planets, satellites, comets, meteors, nebulae and galaxies, etc., collectively referred to as "celestial bodies"; The earth we live on is also a celestial body. When a meteoroid falls to the ground, it becomes an object on Earth.

There is no mention of whether interstellar matter is a celestial body or not. In the Introduction to the Earth, it is clearly stated that interstellar matter belongs to celestial bodies.

In short, it can be said that as long as it is interstellar matter, it is a celestial body.

Their names are: stars, planets, moons, comets, meteoroids, nebulae, air and dust, and there are seven major types. These forms of existence of cosmic matter are collectively known as celestial bodies.

1. The universe is the only space. Only when it is separated from the fundamental matter of the universe, the spatial phenomena and the laws of space formed after the reaction between matter, and is different from the universe, can it be said that it is another space outside the universe, but this space does not exist, so the concept of the universe is the only concept of space.

2. The universe is made up of space and time.

1) Space: Space is composed of two parts.

a. The cosmic space is composed of countless star cluster spaces, and each star cluster space is composed of an unequal number of galaxial spaces such as the solar system.

b. Black hole space.

That's the concept of space.

2) Time: There is no concept of time in the universe of origin and destruction. All space objects in the universe need to continuously maintain their temperature through space gas, which means that space objects are constantly generating gravitational attraction with space gas.

The specific gravity of the matter and the volume of the object are necessarily different from the gravitational attraction that is continuously generated between the space gases. Therefore, there is no absolute stillness between space matter and objects, they are all in constant motion, which is the concept of time.

There are four types of stars in the universe. For the time being, I can tell you three of them: the Earth and the Sun, and the white dwarf and neutron stars. Black holes belong to neutron bodies.

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There are hundreds of millions of planets in the universe, and more importantly, as of now, we don't know how big the universe really is, let alone what else lies beyond it.

Therefore, the planets in the universe can only be roughly calculated in billions.

What's more, there are so many black and white holes in the universe, and the universe is devouring and releasing planets every minute.

The total number of planets in the universe is about 1 trillion billion. We have about 40 billion planets in the Milky Way, and so many of them are so far away that we can't see them, only the galaxy they're in. It's like we can see the woods from kilometers away, but we can't see the leaves.

There are hundreds of billions of galaxies in the universe, and each galaxy is made up of tens of billions of planets.

There are about 700 trillion stars in the entire visible universe, and he said that this is "the most accurate observation data to date". Simon Driver, Ph.D. from the Australian National University's School of Astronomical and Astrophysical Studies, reported that his research team used the most powerful astronomical telescope in the world to select a region of space near the Earth for local observations, and then calculated the number. If you want to literally represent this number, you need to add 22 "0s" after the "7".

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Extended Materials: Hierarchies.

Contemporary astronomical research results show that the universe is a hierarchical and expanding celestial system with diverse material forms and constant motion and development.

Planets, asteroids, comets, and meteoroids all orbit around the central celestial body, the Sun, making up the solar system.

There are other planetary systems outside the solar system as well. About 250 billion sun-like stars and interstellar matter make up the Milky Way, a much larger celestial system. The Milky Way is about 100,000 light-years in diameter, and the Sun is located in one of the spiral arms of the Milky Way, about 10,000 light-years from the galactic center.

There are many similar celestial systems outside the Milky Way, called extragalactic galaxies, often referred to simply as galaxies. With 100 billion galaxies currently observed, scientists estimate that there are at least 2 trillion galaxies in the universe.

Galaxies are clustered into large and small groups, called galaxy clusters. On average, each galaxy cluster has about 100 galaxies with a diameter of tens of millions of light-years. Tens of thousands of galaxy clusters have been discovered. A small cluster of about 40 galaxies, including the Milky Way, is called the Local Group.

A higher-level celestial system formed by several galaxy clusters clustered together is called a supercluster. Superclusters tend to have an elongated shape, with long diameters of hundreds of millions of light-years. Usually superclusters contain only a few clusters of galaxies, and only a few superclusters have dozens of clusters.

The supercluster of galaxies formed by the local group of galaxies and about 50 nearby clusters is called the local supercluster.

Classification of galaxies. According to the sequence number that can reflect the development status of galaxies, galaxies can be roughly divided into five types: elliptical galaxies, lenticular galaxies, spiral galaxies, barred spiral galaxies and irregular galaxies.

What planets are there in the universe?

1. Stars. A star is a spherical luminous plasma held together by gravity, and the Sun is the closest star to Earth. Almost all of the other stars that can be seen on Earth at night are within the Milky Way, but due to their distance, these stars appear to be just fixed points of light.

2. Planets. A planet usually refers to a celestial body that does not emit light on its own and orbits a star. Its rotation is often in the same direction as the rotation of the star it orbits.

Generally speaking, planets need to have a certain mass, and the mass of the planet must be large enough to be nearly spherical, and it cannot undergo nuclear fusion reactions like stars.

3. Asteroids.

An asteroid is a celestial body in the solar system that orbits the sun like a planet, but is much smaller in size and mass than a planet. A small object that orbits a star in an elliptical orbit and does not volatile gas and dust.

4. Neutron star.

Neutron stars are one of the few possible endpoints of a supernova at the end of star evolution through gravitational collapse, a star between a white dwarf and a black hole that collapses at the end of its life before a star with a mass sufficient to form a black hole, and is many times denser than any matter on Earth. A compact star that relies on the pressure of degenerate neutrons to balance with gravity.

5. Galaxies. A galaxy is a system composed of countless star systems (including the self of stars) and dust (such as nebulae). Referring to the Milky Way, it is a large galaxy containing stars, gaseous interstellar matter, cosmic dust and dark matter, and is bound by gravity.

Typical galaxies, ranging from dwarf galaxies with only tens of millions of stars to elliptical galaxies with megastars, all revolve around the center of mass.

Celestial systems are usually composed of hundreds to trillions of stars and interstellar matter, with a spatial scale of several thousand to hundreds of thousands of space-time difference light-years.

6. Nebula. Nebulae contain almost all malleable celestial bodies except planets and comets. Their main ingredient is hydrogen, and their skin is helium, and they also contain a certain proportion of metallic and non-metallic elements.

Since the launch of the Hubble telescope in 1990, research has also found that it contains organic molecules and other substances.

Extended Materials. Such as the sun, planets, moons, asteroids, comets, meteoroids, interplanetary matter in the solar system, stars, star clusters, nebulae, interstellar matter, intergalactic matter in the Milky Way, etc. The infrared, ultraviolet, radio, X-ray, and ray sources discovered by radio and space detection methods are also celestial bodies.

To judge whether a substance is a celestial body, it can be summarized by "three looks": one is to see whether it is the existence form of matter in the universe, although interstellar matter is invisible to the naked eye, it is a celestial body; The second is to see if it is a matter in the universe, and a certain part of the celestial body is not a celestial body; The third is to see whether it is located in the earth's atmosphere, and it is a celestial body located in outer space, and it is not a celestial body located in the earth's atmosphere.

No one knows the exact number.

Let's start with the stars. Stars are all present in galaxies. The number of stars in large galaxies is roughly between 200 billion and 600 billion, and the Milky Way is a large galaxy with about 200 billion and 400 billion stars.

The Andromeda Galaxy is larger than the Milky Way, with about 600 billion stars in it. The number of stars in small galaxies is relatively small, ranging from hundreds of thousands to hundreds of millions. On average, the number of stars in a galaxy is roughly around 200 billion.

The number of galaxies in the observable universe is likely to be around 200 billion.

According to this calculation, the number of stars in the observable universe is as much as 200 billion times 200 billion, which is 22 zeros after 2.

There are also many planets in the universe that do not shine and heat, such as planets and smaller smaller planets. According to the current theory of star formation, there may be an unequal number of planets around a single star, with an average of 5. Most stars in the universe exist in pairs, with only about 25% of the stars being single.

According to this calculation, the number of invisible planets in the observable universe is roughly the same as the number of stars, which is also as much as 2 followed by 22 zeros.

In addition to stars and planets, there are also invisible black holes in the universe, as well as planets that are smaller than planets, such as moons, etc., and this number is not calculated by pure law, or even estimated. So, the number of planets in the universe is really not calculated, there are too many.

At present, there are tens of billions of galaxies in the observable universe, and there are about 100 billion stars in each galaxy, and individual stars will have planets, and some rock families have many them, such as the sun, and some planets and satellites, such as 16 moons have been discovered. According to years of exploration, there are as many as 1 billion galaxies that humans can observe, and the Milky Way alone contains 200 billion planets, and the planets are just a drop in the ocean to the Milky Way, and the number of planets in the universe is like grains of sand on a river beach, which cannot be counted, so it is not an exaggeration to say that the universe is boundless. First of all, 17 billion cosmic worlds can be seen in high-performance space, and there are many extragalactic galaxies that have been observed in the tens of thousands.

Stars in the universe: The universe is the unity of all time, space and its contents, including planets, stars, galaxies, intergalactic space, subatomic particles and all other matter and energy. Some of the cosmic objects observed by humans are roughly made up of ordinary matter (the matter that makes up stars, planets, gases, and dust) or "baryons", and the sum of the "baryons".

In the universe, the Earth is the only planet known to mankind that has life.

From a statistical point of view. From the current observation, there are about 200 billion total galaxies in the universe, about 200 billion galaxies like the Milky Way in each total galaxy, about 200 billion stars in each star Zenming system, each star is on average the same as the sun, and there are about 20 or so large planets, dwarf planets, comets, and about 50 moons. In this way, the planets in the universe are 200 billion 200 billion 200 billion 70 planets, of course, this is not a bend to include asteroids and other small stars.