Are all the stars in the sky white?

Yes, but there is no green one, which is determined by the temperature of the star.

The temperature range of blue O-type stars is about 25,000-50,000 degrees, blue-white B-type stars are about 11,000-25,000 degrees, white A-type stars are about 7,500-11,000 degrees, yellow-white F-type stars are about 6,000-7,500 degrees, yellow G-type stars are about 5,000-6,000 degrees, orange K-type stars are about 3,500-5,000 degrees, and red M-type stars are about 2,000-3,500 degrees.

Each star is subdivided into 0-9 subtypes, and our Sun is a yellow G2 star with a temperature of 6,000 degrees.

Yes, the white ones are the stars with very high temperature and brightness, and the blue and white ones are even more so. The Sun is yellow, Antares is red, white dwarfs are white, and so on.

Yes, in fact, there are not only white ones, but green ones as well. Large planets will perish easily, and small planets will perish later. The stars we see now are actually stars that have long since perished.

No, for example, Mars is red.

Yes, there are a lot of colors, but it's too far away from us, and the light is very weak, so it looks white.

The stars in the sky are celestial bodies in the universe that are visible to the naked eye. The earth is also a celestial body in the universe, and the reason why it looks like a star is because these planets are far away from the earth, and they appear to shine by reflecting the sun's rays, and the stars can be roughly divided into planets, stars, comets, white dwarfs, etc.

The shape of a star in the sky

If not affected by external forces, all objects have a tendency to concentrate towards the center under the action of gravitational force, and the most concentrated result is a spherical shape, although the star is solid on the surface, but because the solid is also deformable, and the solid particles can move, these make it possible to transform it into a spherical shape.

The energy activity inside the stars makes the stars irregularly shaped, but the stones of the mountains are rolled down from a high place by the gravitational pull of the stars, and the rivers carry the sediment from the high places to the low-lying oceans, these are all examples of concentration towards the center, and they all make the stars turn from irregular to spherical, and if the inner life of the star stops, after many billions of years, the star may become a very standard spherical shape.

Many asteroids, due to their own small mass, resulting in 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, so their shape is strange, oval, rod-shaped, but for a variety of reasons, the star is just an ellipsoid close to spherical.

Stars are visible to the naked eye.

6,974 stars are visible to the naked eye.

The factors that determine whether people observe the stars are light or dark.

Stars in the sky.

One is due to the magnitude of the star's ability to shine; The second is the distance between the stars and the people. Astronomers usually divide the ability of stars to shine into 25 magnitudes, with the difference between the strongest and the worst by a factor of about 10 billion.

The brightness of a star is often expressed in terms of magnitude.

The brighter the star, the smaller the magnitude. The magnitude measured on Earth is called the apparent magnitude; A magnitude that is attributed to a distance of 10 parsecs from the Earth is called an absolute magnitude. The magnitude of the same star measured by detection elements that are sensitive to different wavelength bands is generally not equal.

At present, one of the most common magnitude systems is the U (ultraviolet), B (blue), and V (yellow) trichromatic systems (see the photometric system "class=link> photometric systems), with b and v approaching photographic and visual magnitudes, respectively. The difference between the two is the commonly used color index. The Sun is of v=equal, the absolute visual magnitude is m=+, the chromatic index is b-v=, u-b=.

The color temperature can be determined by the color index. Stars that are close to people have a strong ability to emit light, so people see it brightly. However, even if a star with a strong ability to emit light is very far away, its brightness may not be as bright as that of a star that is tens of thousands of times worse than its ability to emit light.

For example, there is a star called Antares that is about 100 million times the size of the Sun and has about 50,000 times the ability to emit light, but because it is 410 light-years away from Earth, people can only see it as a bright star with a red light. If Antares were to be moved to the position of the sun, the light and heat it emitted would bake the earth into a large stone ball where everything had disappeared.

Standing on other stars and looking at the Earth, the Earth is also a star. Most of the stars we can see with the naked eye are larger than the Earth.

Mostly stars, like the sun. It's just far away from us, so it looks small.

Most of the direct sights are stars, with a small number of planets. If you're lucky, you can also see meteorites, comets, and more. Satellites we can only see the moon. Other celestial bodies must be made with astronomical telescopes.

The distant sun.

If you go to Pluto to see the Sun, the Sun is also a star.