What are the stars and what are the stars in the sky?

xīngxīng

English star

1) [star] [mouth] A shimmering celestial body in the night sky.

2) [tiny spot] Small, small dots.

1.[informal] stars; planets; satellites

6973 are visible to the naked eye.

There are two main factors that determine whether people observe the stars as light or dark:

One is due to the size of the star's ability to emit light, and the other is the distance between the star and people.

Astronomers usually divide the ability of stars to shine into 25 magnitudes, with the strongest ones being about 10 billion times different from the worst ones.

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. One of the most versatile magnitude systems is the U (ultraviolet), B (blue), and V (yellow) trichromatic systems (see Photometric Systems'"class=link> metering system); b and v are close to 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.

A star that is close to people has a strong ability to emit light, so people will light up when they see it. However, even if a star is quite capable of emitting light, if it is very far away, then its brightness may not be as bright as that of a star that is tens of thousands of times less capable of emitting light.

Suppose there is a star called Antares that is about 100 million times the size of the Sun and is about 50,000 times more luminous than the Sun, but because it is 410 light-years away from the Earth, one can only see it as a bright star with a red glow. 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.

Stars are cosmic stars with stars, planets, meteors, neutron stars, etc., and meteorites are fragments of meteors that have passed through the atmosphere and have not burned out.

It's a luminous celestial body, and no one can know it in detail.

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.

The process of star formation is very slow and can take millions of years. Before the star was born, it was a huge molecular cloud filled with dust and gas. Such molecular clouds are also called nebulae or dark nebulae; These molecular clouds are rich in large amounts of hydrogen molecules (H2) and helium molecules (He), as well as some other particles.

In general, these molecular clouds are very cold and stable.

However, nearby supernovas**.

Or a galactic collision could unleash a huge shock wave through a molecular cloud.

and energy. ** It is caused by the huge shock wave and energy generated by the collision between the plates. In a molecular cloud, this energy is disturbed by gravity, and it begins to collapse under its own gravity, causing both hydrogen and helium molecules to come together, increasing the mass at the center of the molecular cloud.

As more and more molecules and particles collapse or fall into the center of the cloud, the center begins to heat up. This heated center, or heated core, is called a protostar. Protostars continue to attract more molecules and become hotter and hotter until the temperature and pressure reach a point where the protons can fuse with each other to form helium atoms and release large amounts of light, heat, and radiation.

This process is known as nuclear fusion.

When this happens, the inward force of gravity is slowly balanced by the outward force generated by heat and radiation. Once this pair of forces reaches a long-term stable equilibrium, a star is born.

The brightest planets:

On Earth, five planets can be seen with the naked eye, the brightest of which is Venus. Venus, although far less bright than the Sun and Moon, is more than the famous Sirius.

The brightest star of the day except the Sun) is 14 times brighter, like a dazzling diamond.

Venus is not only very bright, but also has a "personality", it is the solar system.

It is the only large planet that rotates in the opposite direction, from east to west, in the opposite direction of the other planets. Therefore, as seen from Venus, the Sun rises in the west and sets in the east.

The stars in the sky are 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 2.4 million kilometers per hour, and H1504+65 is the hottest white dwarf.

1. Twinkling stars.

2. Bright stars.

3. Dazzling stars.

4. Bright stars.

5. Smooth stars.

Summary. The stars in the sky are celestial bodies in the universe visible to the naked eye, and the earth is also a celestial body in the universe. The reason why it looks like a star is because these planets are very far away from the Earth.

By reflecting the sun's rays, it appears to shine. Stars can be broadly divided into planets, stars, comets, white dwarfs, etc.

What are the stars in the sky?

The stars in the sky are celestial bodies in the universe visible to the naked eye, and the earth is also a celestial body in the universe. The reason why it looks like a star is because these planets are very far away from the Earth. By reflecting the sun's rays, it appears to shine.

Stars can be broadly divided into planets, stars, comets, white dwarfs, etc.

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