How big are the stars and how big are the stars?

The vast majority of the stars we see are stars.

The diameters of different stars have been found in various ways, ranging from a few kilometers to more than 10 kilometers. The size of the stars also 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.

Giants 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 Antares) 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 as big as Jupiter. They are not yet the largest, VV the constellation Cepheus is a pair of binary stars, and its host star A, which 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 column one mentioned above is more than 9 billion times larger than the Sun, and the neutron star is hundreds of trillions times smaller than the Sun. This shows how different a giant is from a dwarf.

The sun, the moon or the stars, which one is bigger? I remember arguing about this a lot as a child. It is now known that the moon, as a satellite of the earth, has a diameter of only 3,476 kilometers, and 49 moons can be worth the size of an earth.

The Sun, which looks as big as the moon in the sky, has a diameter of 10,000 kilometers and can hold 1.3 million Earths. Coincidentally, the diameter of the sun is about 400 times that of the moon, but it is also about 400 times farther from the earth than the moon, so it looks about the same size.

As a satellite, the Moon is the largest of the 66 moons that have been discovered in the solar system. There are only four or five moons larger than the moon, among which Ganyliste, the largest in diameter, has a diameter of more than 5,200 kilometers. Most of the others are only a few tens to hundreds of kilometers away.

As a planet, Earth is the fifth largest planet among the nine planets, which is considered a medium height. The largest Jupiter is 1,300 times the size of Earth, the brightest planet is about the size of Earth, and the red Mars is just over one-eighth the size of Earth.

Planets and moons, compared to the parent of the solar system, the sun, are indeed small things, like sesame seeds and watermelons. The sun is truly unique in the solar system. However, the sun pales in comparison to the sky full of stars that look the size of a pinpoint, and it is just a very ordinary star among billions, and it can only be considered medium-sized.

Antares in Scorpio is 600 times the diameter of the Sun and Betelgeuse is 900 times the radius of the Sun in Orion. There is a larger star in the constellation of Immortal Throne, with a radius of 1,600 times that of the Sun, reaching 1.1 billion kilometers, and if it were placed in the position of the Sun, even Jupiter would be inside it. However, most of them are red giants that are in a late stage of evolution, and their densities are extremely small.

Of course, there are some stars that are much smaller than the Sun. White dwarfs, at the end of their stellar evolution, are smaller than Earth, ranging from a few hundred kilometers to several thousand kilometers in diameter. The smallest star, the neutron star, is only 10 kilometers in diameter.

Don't underestimate these two types of small stars, although they are small, they have a large mass, and they are generally about the size of the sun. So they're all incredibly dense. Neutron stars are 100 trillion times denser than the Sun!

The so-called stars are divided into stars, planets, and satellites.

Stars are generally very large, at least hundreds of times larger than the Sun.

Some planets are the size of the Earth, and some are much larger.

Moons are generally not big, such as the moon is the satellite of the earth, and there are many moons of other planets.

There are also popular, comets, etc., some are small, even a few kilograms, and some are several kilometers large.

The night sky is full of stars, some are very bright, some are dark, and the moon seems to be the largest and brightest, but in fact, the moon is only one of the smallest in the universe, just a satellite.

In the universe, the stars that can be observed by the naked eye are stars, planets and moons. The star is the largest, the asteroid is the smallest, the big one can be tens of thousands of times larger than the sun we are familiar with, or even more, and the small planet may be just a stone with a diameter of two meters.

As for the satellites, we can only observe one with the naked eye, and that is the moon, which is equivalent to 1 49 times the size of the Earth, and our Earth is only one millionth of the size of the Sun, and how big the difference in size is between the visible bodies.

Stars are a general term for all celestial bodies other than the Earth. Stars can be large and small, and small satellites such as the Moon are usually smaller than planets, such as the Moon, which is only a quarter the size of the Earth. Of course, there are also larger moons, such as Jupiter's moon Ganymede, which is much larger than the moon and even larger than Mercury, making it the largest moon in the solar system.

Planets like Earth are planets. The planets are also large and small, the largest is Jupiter, which can fit more than 1,000 Earths. The smallest big planet is Mercury, which is only a little larger than the Moon.

There are also smaller dwarf planets, typically a few hundred kilometers in diameter. The smallest planets are asteroids, generally only 100 kilometers to a few kilometers in size, but they are extremely numerous, perhaps tens of millions.

Missing in the night sky are meteors, which usually weigh only a few grams and are only millimeters to centimeters in size. Comets, also known as broom stars, are "dirty snowballs" formed by the condensation of water ice, dry ice and solid particles, generally ranging from hundreds to tens of kilometers in diameter, that accidentally enter the vicinity of the sun.

The stars we see at night, all but a few planets, are stars in the Milky Way. Most of these stars are larger than the Sun, but they are so far away from us that they appear to be just small spots of light. Some of these stars are much larger than the Sun, such as UY in the constellation Shield, a red supergiant in the constellation Shield.

This star is the largest star known to man. If the Shield Constellation UY were placed in the center of the solar system, it would be larger than Jupiter's orbit in diameter and close to Saturn's orbit. It takes more than 9 hours for light to orbit the star's equator, while light takes only seconds to orbit the Sun's equator.

The star can hold about 4.5 billion suns, or about 200 million Earths.

Planets of the solar system. The blue arrow refers to the Earth.

The Uy of Shields is larger than the Sun, and the smaller dot is the Sun.

The Sun is the closest star to us. When humans more accurately measure the distance between the earth and the sun, they can measure the angle between the two ends of the sun's diameter to the observation instruments on the earth about degrees, which is 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 stars, their images in the telescope have exceeded the resolution limit of the telescope, and their angular diameters cannot be accurately measured, so their size data cannot be obtained.

According to the laws of thermodynamics, the luminosity of a star corresponds to its diameter and temperature. 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.

The stars are huge, some larger than the Earth.

In fact, we can't imagine the star, because we can only see that her small one is actually very large. Because from the sky. If we scatter, we'll only cut a small one.

There are countless stars in the universe. There are big and small. Also, there are smaller than the earth. There are several times and dozens of times larger than the earth. There are also many stars that our human science cannot detect. It takes constant effort.

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.

It is often said that the sky is full of stars. How many stars are there in the sky? The 1st issue of the journal Nature gives the answer: about 3 followed by 23 zeros. For those who like to look up at the stars, counting the stars will be a lot of work.

Peter Van Dowkun, an astronomer at Yale University in the United States, and Charlie Conroy, an astrophysicist at Harvard University, analyzed the intensity of light from galaxies and concluded that the number of galactic red dwarfs was far greater than previously thought.

Previously, astronomers estimated that the number of stars in galaxies was about a trillion times that of 100 billion. This theory is based on the work of Carl Sagan, an astronomer at Cornell University in the United States. Sagan once wrote a best-selling book called "A Hundred Hundred Billion."

He believes that there are 100 billion galaxies in the universe, and each galaxy has 100 billion stars.

After observing distant galaxies in Hawaii with the help of electron telescopes, Van Dokun and his team found that the stars of these distant galaxies were many times or even dozens of times larger than previously thought. "We see 10 to 20 times as many red dwarfs as we do," Van Dokun said. Conroy said that 3 is followed by 23 zeros, which is an astronomical number even for astronomers who calculate distances in light years.

To illustrate the size of the number 23 zeros after 3, Conroy said that each person has about 50 trillion human cells, and there are about 6 billion people on the earth, and the product of the two is exactly 23 zeros after 3. In other words, the stars in the sky are comparable to the total number of human cells on earth.

In addition, Van Dokun and Conroy found that only one-third of galaxies are elliptical like the Milky Way.