How big are the stars? How wide is a star?

It's not fixed. The size of the stars varies from star to star.

Stars in the universe are large and can be up to 600 times the radius of the Sun (the radius of the Sun is about 696,300 kilometers), while the small ones are not visible to the naked eye. Because at the end of star decline, it will continue to collapse towards itself due to its own gravitational relationship, and it will collapse to the size of only atoms and even neutrons. However, it has a very high density and mass, and some of it even emits light, which is observed by humans.

Stars refer to celestial bodies in the universe that are visible to the naked eye. The activity of the energy inside the star makes the star irregularly shaped. Stars can be broadly divided into planets, stars, comets, white dwarfs, etc.

The brightness of a star is often expressed in terms of magnitude. The brighter the star, the smaller the magnitude. The brightest planet is Venus, the fastest star orbiting at more than 240 kilometers per hour, and h1504+65 is the hottest white dwarf.

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The activity of the energy inside the star makes the star irregularly shaped. However, the stones of a high mountain are rolled down from a high place by the gravitational pull of the stars (gravitational pull), and the rivers carry sediment from a high place to the low-lying ocean (rivers also flow by the gravitational pull of the stars) These are all examples of concentration towards the center, and they all make the stars irregularly spherical.

If the interior of the star ceases to move, it is possible that after many billions of years, the star will become a very standard spherical shape (except for centrifugal force and the gravitational pull of other celestial bodies). Many asteroids, due to their relatively small mass, lead to their own gravitational force is relatively small, and the star is generally composed of relatively hard solid rock, it is difficult to complete the process of moving to the center under the action of its own gravity.

In terms of volume, stars are generally larger than the sun. The stars and the sun are both stars, but the sun is close to the earth, so I think the sun is relatively large, in fact, most stars (that is, the so-called stars) are much larger than the sun, and even tens of millions of times larger than the sun, hundreds of millions of times larger.

It's just that the stars are far, far away from human beings, and the reason that the stars are small and small.

Classification of stars.

1. According to the type: stars, planets, satellites, dwarf planets.

This classification is only in the solar system, small celestial bodies (asteroids, comets.

etc.). 2. According to the stage: Nova, main sequence star, red giant, supernova.

It is divided into the following white dwarfs.

neutron stars, black holes).

3. According to size: (maroon-red) dwarfs, (blue, blue-white, yellow, red) giants, (blue, red) supergiants.

4. According to the spectrum: O, B, A, F, G, K, M and additional types such as R, N, S, etc.

5. According to the combination: single star, double star, Juxi Liang slippery star and star cluster.

6. Other classifications: non-variable stars, variable stars. Variable stars are divided into: Cepheid variables, eclipse variables.

The Sun is the closest star to us. When human beings more accurately measured the distance between the earth and the sun, they dismantled the virtual energy to measure the angle between the two ends of the sun's diameter to the observation instruments on the earth to form about degrees, which was converted into radians and multiplied by the distance between the sun and the earth to determine the size of the sun. The diameter of the Sun is about 1.39 million kilometers, which is 109 times the diameter of the Earth.

For some large, bright stars, this is also a straightforward way to determine their size. For example, as early as 1920, the American astronomer Michelson used the meter telescope at the Mount Wilson Observatory to measure the angular diameter of Betelgeuse, and then calculated its size.

Today, it has been accurately measured that Betelgeuse is about 500 1000 times the diameter of the Sun, and belongs to the category of red supergiants. There are about dozens of stars like Betelgeuse that can be directly measured in size. Their common features are:

It is huge, and it is not very far from the earth. For most of the dull stars, their imaging in the telescope has exceeded the resolution limit of the telescope, and its angular diameter cannot be accurately determined, so its size data cannot be obtained.

According to the laws of thermodynamics, the luminosity of a star corresponds to its diameter and thermocommodity. Scientists can use information such as spectra and celestial ranging to derive the luminosity and temperature of the star, and then deduce the diameter of the star and obtain information about the size of the star. This is also the most commonly used measurement method by far.

Most of the stars that can be seen in the sky are stars, and the size of the stars varies greatly, some are giants, and some are dwarfs. The diameter of the Earth is about 13,000 kilometers, and the diameter of the Sun is 109 times that of the Earth. Giant stars are the largest in the star world, and they are tens to hundreds of times larger than the Sun.

Supergiants are even larger, with the red supergiant Antares (i.e., the constellation Celestia) being 600 times the diameter of the Sun; The red supergiant Betelgeuse (Orion) is 900 times the diameter of the Sun, and if it were in the Sun's position, it would be almost the size of Jupiter. They are not yet the largest, the Cepheus VV is a pair of binary stars, and its host star A is 1600 times the diameter of the Sun; HR237 is 1,800 times the diameter of the Sun. There is also a binary star called Pillar One, whose companion star is larger than the main star, 2,000-3,000 times the diameter of the Sun.

These giants and supergiants are giants in the stellar world. Now that we've seen the giants in the stellar world, let's take a look at the gnomes among them. In the stellar world, the Sun is medium in size, and there are many stars smaller than the Sun, the most prominent of which are white dwarfs and neutron stars.

White dwarfs are only a few thousand kilometers in diameter, about the same as Earth, and neutron stars are even smaller, they are only about 20 kilometers in diameter, and both white dwarfs and neutron stars are dwarfs in the stellar world. We know that the volume of a sphere is proportional to the cube of the radius. If we compare the volume, the pillar one mentioned above is more than 9 billion times larger than the sun, and the neutron star Zheng Feng is hundreds of trillions times smaller than the sun.

From this, we can see how different the difference between giants and gnomes is.