Planetary name

In ancient Roman mythology, Mercury was the god of commerce, travel and theft, that is, Hermes in ancient Greek mythology, the god who sent letters to the gods. Perhaps it is because Mercury moves rapidly in the air, so it is named.

Mercury was discovered as early as 3000 BC in Sumerian times, and the ancient Greeks gave it two names: Apollo when it first appeared in the morning and Hermes shining in the night sky. However, ancient Greek astronomers knew that these two names actually refer to the same star, and Heraclitus (a Greek philosopher in the 5th century BC) even thought that Mercury and Venus revolved around the sun instead of the earth.

Venus Venus

1. Venus is very bright and is called "the jewel in the sky", "the morning star" or "the night star". Juventus is a shining star, and countless honors can testify!

Venus is the "god of love and beauty" in Rome, and Aphrodite is called "sexy goddess" in Greek mythology, which is what we often call "sexy goddess". One of the main gods of Olympus 12.

Earth Earth

1. Earth, our great mother. Reddish sunset, orange sunset, golden desert, green sea, green grassland, blue sky and purple volcanic cloud. You are a rainbow, you are a changeable volcanic cloud, and I am fascinated by your beauty.

2. Gaia, the concept of Atlantis legend has also been introduced into Greek mythology. "Mother of the Earth" Gaia (Gaia of Atlantis, the legendary God of Atlantis, the grandmother of Zeus in Greek mythology. She created Uranus, a god, and then combined with him. Her descendants have 12 Titan gods. She and her children created everything in the world, including human beings.

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Mars (Greek: Ares) is called the God of War. This may be due to its bright red color; Mars is sometimes called the "red planet". Interesting note: Before the Greeks, the ancient Romans once offered sacrifices to Martians, who were a god who seldom talked about agriculture. The aggressive Greeks regarded Mars as a symbol of war, and the name of March also came from Mars.

Humans have known about Mars since prehistoric times. Because it is considered to be the best place for human beings to live in the solar system (except the earth), it is loved by science fiction writers. But it is a pity that Lowell "saw" the famous "Canal" and other things, just like the princesses of Barsoumian, are all fictitious.

Jupiter Jupiter

1. Jupiter, the largest of the nine planets, collided with Jupiter in July 1994. Just like throwing dust at Jupiter, Jupiter is still fine! Just like Juve is number one in Serie A, although we beat the San Siro, we still have nothing to do! ! !

2. Jupiter, Jupiter is also the name of Zeus, the god of gods in Greek mythology, in Roman mythology. He is the ruler of all gods. Needless to say, we are the kings of Serie A! ! ! The head of the god of Olympus 12.

Saturn

1. Saturn, Saturn is famous for its three rings. Saturn is the second largest planet in mass after Jupiter. Hehe, we have almost three stars on our chests. Come on ~ ~ ~ ~ ~

2. In Roman mythology, Saturn is the "god of agriculture", which ranks behind Jupiter, the "god of gods". One of the main gods of Olympus 12. Juventus, like all working people, is diligent and practical, revealing the beauty of simplicity and calmness.

Uranus

1. Uranus, Uranus has many satellites, and people have given names to these satellites. Many satellite names come from Shakespeare's plays. There is a satellite called Juliet, which comes from Romeo and Juliet. Ai Lier in the storm. These moons around Uranus are like many stars in Juventus. They are very famous. ! !

2. Uranus, Uranus is also the Roman name of "God of the sky" in Greek mythology, and he is also the father of Zeus (Jupiter). How does Juve remain invincible on the issue of father and son?

Neptune Neptune

1. Neptune, the most mysterious planet, is poorly understood by human beings. What do we know about the mysterious charm of Juventus?

2. Poseidon Poseidon, Poseidon is the "Poseidon" in Greek mythology. He controls all the oceans in the world. One of the main gods of Olympus 12.

Pluto Pluto

Pluto, Hades in Greek mythology, is a great god in charge of the underworld. Pluto may get such a name because it is so far away from the sun that it is almost completely in darkness.

References:

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Respondent: houbin 365 1- 14 Grade 6- 14 19:22.

Mercury, the closest to the sun, is the second asteroid in the solar system. The English name of Mercury comes from the Roman god Mercury. Mercury, also known as Hermes in Greek mythology (Hermes, the god who sent information to the gods, was in charge of commerce, roads, science, invention, eloquence, luck and so on. ) Maybe Mercury gets its name from its rapid movement in the air. The symbol is a circle above, a short vertical line crossing below and a semicircle (? ) is the shape of a mercury wand. In the 5th century, Mercury was actually considered as two different planets, because it often appeared alternately on both sides of the sun. When it appears in the evening, it is called mercury; But when it appeared in the morning, it was called Apollo to commemorate Apollo, the sun god. Pythagoras later pointed out that they were actually the same planet. In ancient China, Mercury was called the "morning star".

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Q o ~, q venus is the second closest and sixth largest planet to the sun in the solar system. Of all the planets, Venus' orbit is the closest to a circle with a deviation of less than 1%. The ancients in China called Venus "Taibai" or "Taibai Venus", also called "Qi Ming" or "Chang Gung". The ancient Greeks called it Aphrodite, the goddess of love and beauty in Greek mythology. In Roman mythology, the goddess of love and beauty is Venus, so Venus is also called Venus. Perhaps for the ancients, it was the brightest planet known. There are also some objections that Venus is named because its surface resembles that of a woman. ) The astronomical symbol of Venus is represented by the dressing mirror of Venus. Phase change of Venus Venus, like the moon, also has periodic changes (phase changes), but Venus is too far away from the earth to be seen by the naked eye. Regarding the phase transition of Venus, Galileo used it as a strong evidence to prove Copernicus and Heliocentrism.

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JYpf9V)@$wi Canada Through Train Forum Home The Earth is the third largest terrestrial planet and the fifth largest planet in the solar system, with an estimated age of about 4.5 billion years (4.5× 109). Earth is the only name that doesn't come from Greece or Rome. The word earth comes from old English and Germanic. Of course, there are many other languages. In Roman mythology, the goddess of the earth is called Tellus-fertile land (Greek: Gaia, Gaia, Mother Earth). It was not until the Copernican era of16th century that people realized that the earth was just a planet.

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V+K3f-BC Canada, through train, Canadian through train, Canadian Chinese website, Toronto Chinese website, Chinese website, immigration, study abroad, Canadian information, Toronto information, Chinese life, Canadian immigrants, North American immigrants, Chinese, Chinese employment, forum Mars is the fourth farthest from the sun and the seventh largest planet in the solar system. Because Mars looks blood-red in the night sky, in the west, it is named after Mars myth, namely Mars in Roman mythology (or Ares in Greek mythology). Humans have known about Mars since prehistoric times. Because it is considered to be the best place for human beings to live in the solar system (except the earth), it is loved by science fiction writers. But it is a pity that Lowell "saw" the famous "Canal" and other things, just like the princesses of Barsoumian, are all fictitious. In ancient China, Mars was called "sparkling" because it was as bright as fire. Mars has two small natural satellites: Phobos and Deimos (the name of the son of Ares). Both satellites are small and strangely shaped, which may be asteroids captured by gravity. The prefix areo- means Mars in English. Canada through train forum home page q

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Jupiter is the fifth and largest planet from the sun, twice the mass of all other planets combined (3 18 times that of the earth). Jupiter is the fourth brightest object in the sky (second only to the sun, the moon and Venus; Sometimes Mars is brighter. Jupiter is the planet with the fastest rotation. In ancient China, it was used to record the years, so it was called the Lunar Star. In the west, it is called Jupiter, the king of the gods in Roman mythology, equivalent to Zeus in Greek mythology.

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(J！ K$@}dOwww.mycanadaexpress.com Saturn is the sixth planet from the sun. Saturn is a huge gas planet and the second largest planet in the solar system after Jupiter. In ancient China, it was called revitalization or filling star. Saturn's English name (and Saturn's name in most other European languages) is named after the Roman god Saturn. Cronus, the god of agriculture in Greek mythology, is the son of Uranus and Kaya and the father of Zeus (Jupiter). Before 1977, Saturn's ring was always considered as the only one in the solar system; But in 1977, a dim halo was found around Uranus, and soon after that, rings were also found around Jupiter and Neptune. 0x*h#_

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h？ Uranus is the seventh farthest planet from the sun in the solar system, arranged outside Saturn and inside Neptune. Its color is gray-blue, and it is a gas giant planet. Uranus is the third largest planet in the solar system; But if calculated by mass, it is lighter than Neptune, ranking fourth. Uranus was named after Uranus, a god in Greek mythology, and it should be pronounced "YOORa nus". Uranus is the god of the universe in ancient Greek mythology and the earliest supreme god. He is the son and wife of Kaya and the father of Cronus (Saturn), Cyclops and Titan (the predecessor of Mount Olympus). Provide information about immigration, study abroad, life, leisure and experience in Canada &; m*u%xOE(I 1^i

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Neptune, the eighth of the nine planets in the solar system, is a huge planet. Neptune is the first planet discovered by celestial mechanics calculation. Because the orbit of Uranus is different from that calculated, 1845 John? Foucault? Adams and Eban? Qin Weiye calculated the possible position of an unknown planet outside Uranus. 1September 23, 846 John, Director of the Berlin Observatory? Godfrey. Gail really discovered a new planet in this position: Neptune. At present, Neptune is the second farthest planet from the sun in the solar system. The name of Neptune is Neptune in Roman mythology. In ancient Greek mythology, Poseidon was called Poseidon.

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Pluto is the farthest and smallest of the nine planets in the solar system, which was discovered in 1930. Because it is farthest from the sun, it is also very cold, much like the place where proto, the god of the underworld in Roman mythology, lives, so it is called Pluto. Pluto is what the Greeks call Hades, the god of the underworld.

Interviewee: ljq 15484 195- trainee magician level 2 6- 14 19:23.

universe

They are all celestial bodies, and comets are made up of frozen impurities and dust. Astronomers vividly call it a "dirty snowball". When it runs near the sun, under the action of sunlight and heat, the dirty snow, solidified gas and ice on the outer layer of the "dirty snowball" quickly evaporate, gasify, expand and erupt. At this time, the volume of the comet expanded rapidly and was obviously divided into two parts: the head and the tail of the comet. The brightest part in the center of the comet's head is the nucleus, which is the main body of the "dirty snowball"; The substance vaporized and erupted on the surface of the nucleus is wrapped around the nucleus, forming a coma. The coma is also covered with a thin layer of hydrogen cloud, called comet cloud. The tail dragging behind the coma head is the coma tail, which is formed because the gas, dust and other substances in the coma head are pushed out by the strong radiation pressure of the sun and the solar wind. So the tail always turns its back on the sun, and the closer it is to the sun, the longer it is.

Asteroids are celestial bodies orbiting the sun, but they are too small to be called planets. Asteroids can be as big as ceres, with a diameter of about 1000 km, or as small as pebbles. There are 16 asteroids with a diameter of more than 240 kilometers. They are located in space from Earth's orbit to Saturn's orbit. Most asteroids are concentrated in the asteroid belt between the orbits of Mars and Jupiter. Some asteroids' orbits intersect with the Earth's orbit, and some asteroids have collided with the Earth.

Asteroids are remnants of the solar system. One guess is that they are the remains of a planet that was destroyed in a huge collision a long time ago. However, these asteroids are more like matter that never formed a single planet. In fact, if all the asteroids are added together to form a single celestial body, its diameter is less than 1500 km-smaller than the radius of the moon.

Because asteroids are materials of the early solar system, scientists are very interested in their composition. When the space probe passed through the asteroid belt, it was found that the asteroid belt was actually very empty and the asteroids were far apart. The asteroid data obtained before 199 1 year were only observed on the ground. 199 1 In June, Galileo Jupiter visited asteroid 95 1 Gaspula, thus obtaining the first high-resolution asteroid photo. 1In August, 993, Galileo flew over the asteroid 243 Ida, becoming the second asteroid visited by a spaceship. Gaspra and Ida asteroids are both rich in metals and belong to S-type asteroids.

We have learned a lot about asteroids by analyzing the space junk falling on the earth's surface. Those asteroids that collide with the earth are called meteoroids. When a meteoroid intrudes into our atmosphere at high speed, its surface vaporizes due to the high temperature generated by friction with air, and gives off strong light, which is a meteor. If a meteoroid does not burn completely and falls to the ground, it is called a meteorite. Hey? Through the analysis of all meteorites, 92.8% of them are silica (rocks), 5.7% are iron and nickel, and the rest are a mixture of these three substances. Meteorites with high stone content are called meteorites, and meteorites with high iron content are called meteorites. Because meteorites are very similar to earth rocks, it is difficult to distinguish them.

1On June 27th, 997, the near-earth probe passed by the 253 Mathilde asteroid. This opportunity enabled scientists to observe this carbon-rich C-type asteroid for the first time. This visit is the only one, because the near-earth detector is not specially used to check it. NEAR was used to investigate the Eros asteroid in 1999+ 10.

Astronomers have made ground observations on many asteroids. Some famous asteroids are Toutais, Castalia, Vesta and Geographos. For asteroids Toutatis, Castalia and Geographos, astronomers study them by radio observation on the ground when they are close to the sun. Vesta asteroid discovered by Hubble Space Telescope.

The discovery of asteroids is closely related to the proposition of Titius-Bode law. According to this law, there should be a planet 2.8 astronomical units away from the sun. 180 1 On New Year's Day, Piacci really discovered the first asteroid ceres there. In the following years, Venus, Venus and Vesta with orbits similar to Ceres were discovered one after another. With the introduction of astrophotography and the use of flash comparator, the annual discovery rate of asteroids has been greatly improved. By 1940, there are 1564 asteroids permanently numbered. Among them, German astronomers Cohen and Hansen have made great contributions because they are good at orbit calculation, while Wolff and Reinmus have made many discoveries in their observations.

The naming right of asteroids belongs to the discoverer. In the early days, I liked to use the name of the goddess, and later changed it to the abbreviation of people's names, places, flowers and even institutions. Some asteroid groups and asteroids are particularly famous, such as Toroyan Group, Apollo Group, Icarus, eros, Kildargo and so on. According to the statistical analysis of orbital elements, the number of asteroids with orbital inclination of about 5 degrees and eccentricity of about 0. 17 is the largest. According to the average heliocentric distance of asteroids, the Kirkwood gap is the most famous distribution feature. There is a statistical relationship between the number n of asteroids and the average magnitude m of solar eclipse, logN=0.39m-3.3, and the statistical formula logd (km) =3.7-0.2g between the diameter d of asteroids and the absolute magnitude g. The distribution of the number of asteroids with the diameter is discontinuous around the diameter of 30 km.

There are many satellites, and only Io 1 is introduced here. Io was discovered by Galileo and Marius in 16 10.

Unlike satellites in the outer solar system, Io and Europa are similar in composition to terrestrial planets and are mainly composed of hot silicate rocks. Galileo's recent data show that Io has an iron core (possibly mixed with iron sulfide) with a radius of at least 900 kilometers.

The surface of Io is different from other stars in the solar system, which surprised Voyager scientists at first contact. They believe that Earth-like stars should be covered with craters of all sizes left by the impact, and then the age of the planet's crust can be estimated by the "craters" left in the unit area. But in fact, there are only a handful of craters on Io's surface. In this way, the surface is very young.

Besides craters, Voyager 1 has discovered hundreds of craters, some of which are still active! Feather ejecta are as high as 300 kilometers. These amazing photos were sent back by Galileo (below) and Voyager (right). This may be the most important discovery in Voyager's mission, and it is also the first time to actually prove the heat and activity inside the Earth-like star. These substances seem to be ejected from the crater in the form of sulfur or sulfur dioxide. The volcano erupted quite quickly, but in the four months after the arrival of Voyager 1 and Voyager 2, some activities stopped and others started again. The deposits around the nozzle also changed obviously.

According to recent photos taken from NASA's infrared telescope equipment in Mauna Kea Mountain, Hawaii, Io has a huge new volcanic eruption (right). The new situation in La Patra has been seen by Hubble telescope. Photographs from Galileo also show some changes in its surface since Voyager came into contact with it. These observations prove that Io's surface is indeed quite active.

Io has amazing terrain: there are craters thousands of meters deep, fiery sulfur lakes (lower right), obvious non-volcanic mountains (left), and hundreds of kilometers of viscous liquid (some form of sulfur? ), and some craters. The colors of sulfur and its compounds make Io's surface colorful.

The analysis of Voyager's photos convinced scientists that the lava flow on Io's surface was mostly composed of hot sulfur compounds. However, subsequent research based on the surface shows that the temperature there is too high and there will be no liquid sulfur. At present, there is a theory that Io's lava flow is composed of hot silicate rocks. Recent observations by Hubble telescope show that those substances may be rich in sodium, or that substances in different places there have different compositions.

The hottest temperature on Io's surface can reach 1500 Kelvin, although its average temperature is only about 130 Kelvin. These hot spots are the main reason why Io loses heat.

The energy needed for all its activities may come from tidal force, which interacts with Europa, Ganymede and Jupiter. The dynamic relationship between these three satellites is fixed. The period of revolution of Io is twice that of Europa, and the latter is twice that of Ganymede. Although Io, like the moon, the satellite of the earth, only faces its main star with a fixed side, it is a little unstable because of the role of Europa and Ganymede. It makes Io twist and bend, about 100 meters long (100 spring tide! ) and generates energy in the cycle of restoring distortion. The moon is not heated by the earth in this way because it lacks another star to disturb it. )

Io also cuts Jupiter's magnetic field lines to generate electricity. For tidal power generation, the energy generated is not much, but the current power is still 1 MW. It also stripped off some Io material, which produced strong convex radiation around Jupiter. The particles separated from the convex surface partially create Jupiter's huge magnetosphere.

Recent data from Galileo show that Io may have its own magnetic field, just like Ganymede.

Io's atmosphere is very thin and consists of sulfur dioxide and other gases.

Unlike other satellites discovered by Galileo, Io has almost no water. This may be because Jupiter was too hot at the beginning of the evolution of the solar system, which made the volatile substances near Io evaporate, but it was not hot enough to squeeze out all the water.

star

Looking at the night sky from the earth, the universe is a world of stars.

The distribution of stars in the universe is uneven. From the day they were born, they gathered in groups and reflected each other, forming binary stars, clusters and galaxies. ...

A star is a burning planet. Generally speaking, the volume and mass of stars are relatively large. It is only because it is too far away from the earth that the starlight appears so weak.

Ancient astronomers thought that the position of a star in the starry sky was fixed, so they named it "Star", which means "Eternal Star". But today we know that they have been moving at high speed. For example, the sun takes the whole solar system around the center of the Milky Way. But other stars are too far away from us, and it is difficult for us to detect the changes in their positions.

The ability of stars to shine is strong and weak. Astronomy is expressed by "luminosity". The so-called "luminosity" refers to the energy radiated by the surface of a star in the form of light. There are also high and low temperatures on the surface of stars. Generally speaking, the lower the surface temperature of a star, the redder its light; The higher the temperature, the bluer the light. The higher the surface temperature, the larger the surface area and the greater the luminosity. Scientists can extract a lot of useful information from the color and luminosity of stars.

Historically, astronomer hertzsprung and philosopher Russell first put forward the relationship between star classification and color and luminosity, established a star evolution relationship named "Herzog-Roto", and revealed the secret of star evolution. In "Herro-Roto", from the high-temperature strong light area at the upper left to the low-temperature weak light area at the lower right, it is a narrow star-intensive area, and our sun is also in it; This sequence is called the main sequence, and more than 90% stars are concentrated in the main sequence. Above the main sequence area are the giant star and Supergiant star area; On the lower left is the white dwarf region.

Stars are born from interstellar dust in space (scientists call it "nebula" or "interstellar cloud").

The "youth" of a star is the longest golden stage in his life-the main sequence stage, which accounts for 90% of his life. During this period, the stars emit light and heat with almost constant luminosity, illuminating the surrounding space.

Then the star will become turbulent and become a red giant; Then, the red giant will complete all tasks in the explosion, throwing most of the matter back into space, leaving behind debris, perhaps white dwarfs, perhaps neutron stars, or even black holes. ...

In this way, the star came out of the nebula and returned to the nebula, completing its brilliant life.

Gorgeous stars are always the most beautiful scenery in the night sky.

Nebulae are remnants of the explosion of stars.

Solar System The solar system is a celestial system consisting of the sun, planets and their satellites, asteroids, comets, meteors and interplanetary matter, and the sun is the center of the solar system. In the huge solar system family, the mass of the sun accounts for 99.8% of the total mass of the solar system, and the proportion of nine planets and tens of thousands of asteroids is very small. They have been running around the sun along their own orbits for ages, and at the same time, the sun has generously and selflessly contributed its own light and heat, warming every member of the solar system and promoting their continuous development and evolution.

In this family, the planet closest to the sun is Mercury, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. Only five stars can be seen by the naked eye. The names of these five stars are different in different countries. There was a theory of five elements in ancient China, so the five elements of gold, wood, water, fire and earth were used to name Venus, Jupiter, Mercury, Mars and Saturn respectively. This is not because there is water on Mercury and trees on Jupiter. On the other hand, Europe calls Roman mythical figures by their names. The three distant planets discovered in modern times are called by the names of the gods of the sky, the ocean and the earth according to the tradition of naming mythical figures in the west, and are correspondingly translated into Uranus, Neptune and Pluto in Chinese.

The nine planets and the sun are the sun, Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury and Pluto in descending order. According to the standards of mass, size, chemical composition and distance from the sun, it can be roughly divided into three categories: terrestrial planets; Giant planets (Jupiter and Saturn); The distant planets Uranus, Neptune and Pluto. When they rotate, they have the characteristics of * * * plane, same direction and approximate circle. There are hundreds of thousands of asteroids of different sizes and shapes between Mars and Jupiter. Astronomy calls this area the asteroid belt. In addition, the solar system also includes many comets and countless whispers-meteors.

The solar system is a celestial system composed of the sun, planets and their satellites, asteroids, comets, meteors and interplanetary matter, and the sun is the center of the solar system. In the huge solar system family, the mass of the sun accounts for 99.8% of the total mass of the solar system, and the proportion of nine planets and tens of thousands of asteroids is very small. They have been running around the sun along their own orbits for ages, and at the same time, the sun has generously and selflessly contributed its own light and heat, warming every member of the solar system and promoting their continuous development and evolution.

In this family, the planet closest to the sun is Mercury, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. Only five stars can be seen by the naked eye. The names of these five stars are different in different countries. There was a theory of five elements in ancient China, so the five elements of gold, wood, water, fire and earth were used to name Venus, Jupiter, Mercury, Mars and Saturn respectively. This is not because there is water on Mercury and trees on Jupiter. On the other hand, Europe calls Roman mythical figures by their names. The three distant planets discovered in modern times are called by the names of the gods of the sky, the ocean and the earth according to the tradition of naming mythical figures in the west, and are correspondingly translated into Uranus, Neptune and Pluto in Chinese.

The nine planets and the sun are the sun, Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury and Pluto in descending order. According to the standards of mass, size, chemical composition and distance from the sun, it can be roughly divided into three categories: terrestrial planets; Giant planets (Jupiter and Saturn); The distant planets Uranus, Neptune and Pluto. When they rotate, they have the characteristics of * * * plane, same direction and approximate circle. There are hundreds of thousands of asteroids of different sizes and shapes between Mars and Jupiter. Astronomy calls this area the asteroid belt. In addition, the solar system also includes many comets and countless whispers-meteors.

The solar system is a celestial system composed of the sun, planets and their satellites, asteroids, comets, meteors and interplanetary matter, and the sun is the center of the solar system. In the huge solar system family, the mass of the sun accounts for 99.8% of the total mass of the solar system, and the proportion of nine planets and tens of thousands of asteroids is very small. They have been running around the sun along their own orbits for ages, and at the same time, the sun has generously and selflessly contributed its own light and heat, warming every member of the solar system and promoting their continuous development and evolution.

In this family, the planet closest to the sun is Mercury, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. Only five stars can be seen by the naked eye. The names of these five stars are different in different countries. There was a theory of five elements in ancient China, so the five elements of gold, wood, water, fire and earth were used to name Venus, Jupiter, Mercury, Mars and Saturn respectively. This is not because there is water on Mercury and trees on Jupiter. On the other hand, Europe calls Roman mythical figures by their names. The three distant planets discovered in modern times are called by the names of the gods of the sky, the ocean and the earth according to the tradition of naming mythical figures in the west, and are correspondingly translated into Uranus, Neptune and Pluto in Chinese.

The nine planets and the sun are the sun, Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury and Pluto in descending order. According to the standards of mass, size, chemical composition and distance from the sun, it can be roughly divided into three categories: terrestrial planets; Giant planets (Jupiter and Saturn); The distant planets Uranus, Neptune and Pluto. When they rotate, they have the characteristics of * * * plane, same direction and approximate circle. There are hundreds of thousands of asteroids of different sizes and shapes between Mars and Jupiter. Astronomy calls this area the asteroid belt. In addition, the solar system also includes many comets and countless whispers-meteors.

The solar system is a celestial system composed of the sun, planets and their satellites, asteroids, comets, meteors and interplanetary matter, and the sun is the center of the solar system. In the huge solar system family, the mass of the sun accounts for 99.8% of the total mass of the solar system, and the proportion of nine planets and tens of thousands of asteroids is very small. They have been running around the sun along their own orbits for ages, and at the same time, the sun has generously and selflessly contributed its own light and heat, warming every member of the solar system and promoting their continuous development and evolution.

In this family, the planet closest to the sun is Mercury, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. Only five stars can be seen by the naked eye. Countries have different names for these five stars. In ancient China, there was a theory of five elements, so gold, wood and water were used.