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Special topics on the solar system-a summary

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.

Special topic of solar system-the source of all things in the sun

In the morning, when the sun bursts out from the rosy clouds all over the sky, sprinkling golden light on the earth, a vigorous passion will come out of generate. Seeing this vibrant world, people can't help loving and praising the sun, which is the master of all things and gives us life and strength.

The ancestors of the Chinese nation regarded their ancestor Yan Di as the sun god. In colorful Greek mythology, the sun god is called "Apollo". He holds a lyre in his right hand and a golden ball symbolizing the sun in his left hand, which makes the light shine on the earth and sends warmth to the world. He is the god that everyone worships. In astronomy, the symbol "⊙" of the sun is very similar to our hieroglyph "Sun", which symbolizes the egg of the universe.

The mass of the sun is more than 330,000 times that of the earth, its volume is about 1.3 million times that of the earth, and its radius is about 700,000 kilometers, which is more than 1.09 times that of radius of the earth. Even so, she is just an ordinary star in the universe.

The interior of the sun, from the inside out, consists of nuclear reaction area, radiation zone and convection zone.

Special topic of solar system-Moon Guanghan Palace

Whenever night falls, a bright moon rises in the night sky, and the clear moonlight spreads all over the earth, which makes people think a lot. Scholars especially like the moon. The Tang Dynasty poet Zhang said that "whoever sees the moon at the first sight on the river shines at the beginning of the month", and the Song Dynasty writer Su Shi said that "when will the moon ask for wine" are all well-known poems about the moon.

The moon is commonly known as the moon, also known as the Moon. In ancient myths of China, there are countless stories about the moon. In ancient Greek mythology, the name of the goddess of the moon was Artemis, and she was also the goddess of hunting. The astronomical symbol of the moon is like a curved thin slice, and it also symbolizes Artemis' bow.

When the moon is bright, we can clearly see that there are dark parts and bright areas on the moon. When early astronomers observed the moon, they thought that the dark area was covered by seawater, so they called it "sea". The more famous ones are the sea of clouds, the wet sea and the sea of tranquility. The bright part is the mountains, where mountains are stacked and criss-crossed, and craters are dotted. Bailey Crater is located near the South Pole, with a diameter of 295 kilometers, which can hold the whole Hainan Island. The deepest crater is Newton crater with a depth of 8788 kilometers. Besides craters, there are ordinary mountains on the moon. Mountains and valleys overlap, giving you a unique perspective.

The age of the moon, about 4.6 billion years, is closely related to the earth. The moon also has layered structures such as shell, mantle and core. The average thickness of the outermost lunar shell is about 60 ~ 65 kilometers. Below the lunar crust to the depth of 1000 km is the lunar mantle, which occupies most of the volume of the moon. Below the moon mantle is the moon nucleus, the temperature of which is about 1000 degrees, and it is likely to be in a molten state. The moon is about 3476 kilometers in diameter, which is 3/ 1 1 of the earth. Its volume is only 1/49 of the earth's, and its mass is about 735 billion tons, which is equivalent to 1/8 1 of the earth's mass. The gravity on the surface of the moon is almost equal to 1/6 of the gravity of the earth.

Special topic of solar system-messenger of mercury god

Mercury is the closest planet to the sun among the nine planets. In ancient China, Mercury was called a star. Westerners call it mercury, which is the messenger of the gods in Roman mythology. Mercury is worthy of the title of messenger: it is the fastest moving planet in the solar system. The average speed of Mercury's revolution is 48 kilometers per second, and that of period of revolution is about 88 days.

Because mercury is too close to the sun and small, it is difficult for people to see it at ordinary times. The surface of mercury is very similar to the moon. It was covered with craters of all sizes. Mercury's atmosphere is extremely thin, and the temperature difference between day and night is very large. During the day, the surface temperature can reach more than 427 degrees, and the minimum temperature at night can be reduced to about-173 degrees.

Mercury has a radius of 2,440 kilometers, which is 38.3% of that of radius of the earth. Mercury is 5.62% of the earth's volume and 0.05 times of the earth's mass. Mercury looks like the moon, but it looks like the earth inside, and it is also divided into three layers: shell, mantle and core. Astronomers speculate that mercury's shell is made of silicate and its center has an iron core larger than the moon.

Mercury's rotation period is 58.646 days, and its rotation direction is the same as its revolution direction. Because the rotation period is very close to that of period of revolution, a day and night on Mercury is much longer than one rotation of Mercury. Its day and night are 176 days for us, 88 days in the day and 88 days in the night.

Mercury has no satellites, so the night of Mercury is lonely. There is no moon there. Besides the sun, the brightest star in the sky is Venus.

Special topic of solar system-Mars Red God of War

Mars is one of the nine planets, ranking fourth in the sun from near to far. To the naked eye, Mars is a striking lux star, moving slowly among the stars. On the earth, it moves forward and backward, and its brightness often changes. At the darkest time, the apparent magnitude is+1.5, and at the brightest time it is much brighter than Sirius, reaching -2.9. Because Mars is as bright as fire, its brightness changes frequently and its position is not fixed, so China called Mars "sparkling" in ancient times. In ancient Roman mythology, Mars was compared to the myth of Mars, the god of war, dressed in armor and covered in blood. In Greek mythology, Mars is also regarded as the god of war.

The soil on the surface of Mars contains a lot of iron oxide. Due to long-term exposure to ultraviolet rays, iron will form a layer of red and yellow oxides. To exaggerate, Mars is like a world full of rust. Because Mars is far away from the sun, the solar radiation energy it receives is only 43% of that of the earth, so the average temperature on the ground is about 30 degrees Celsius lower than that of the earth, and the temperature difference between day and night can reach hundreds of degrees Celsius. Near the equator of Mars, the highest temperature can reach about 20℃. Mars also has an atmosphere. Its main component is carbon dioxide, accounting for about 95%, and a very small amount of carbon monoxide and water vapor.

Mars is smaller than the Earth, with an equatorial radius of 3,395km, which is half of the Earth's, its volume is less than 1/6 of the Earth's, and its mass is only110 of the Earth's. Like the earth, Mars has the structure of core, mantle and crust.

The rotation of Mars is very similar to that of the Earth, with a rotation time of 24 hours, 37 minutes and 22.6 seconds. A day and night on Mars is slightly longer than a day and night on Earth. Mars makes a revolution of about 687 days, and a year of Mars is about two years for the Earth.

Mars has two satellites. One near Mars is called Phobos, and the other farther away is called Phobos. Because Mars is regarded as the god of war in Greek mythology, astronomers named its two moons after his two sons Phobos and Driss.

Special topic of solar system-king of Jupiter's nine planets

Jupiter is the largest of the nine planets and can be called "the king of the nine planets". Ranked fifth in the order from near to far from the sun. In astronomy, giant planets such as Jupiter are called "giant planets". Jupiter is also one of the brightest stars in the sky, second only to Venus and brighter than Sirius, the brightest star.

In ancient China, people used Jupiter to date years, so they called it "the year-old star". Western astronomers call Jupiter "Jupiter". Jupiter is the king of the gods in Roman mythology, equivalent to the omnipotent Zeus in Greek mythology.

Jupiter is a oblate sphere, and its equatorial diameter is about 142800 km, which is 1 1.2 times that of the earth. The volume is 13 16 times that of the earth; Its mass is one and a half times that of all planets, satellites, asteroids and meteoroids in the solar system, and 3 18 times that of the earth. If you put the earth and Jupiter together, it will be as different as the proportion of sesame and watermelon. However, the density of Jupiter is very low, and the average density is only 1.33 g/cm3.

The composition of Jupiter's atmosphere is similar to that of the sun, with a central temperature of 30,000 degrees Celsius, while the temperature of the upper atmosphere is around-140 degrees Celsius. Jupiter also has a strong magnetic field, and the magnetic field intensity on its surface is about 10 times that of the earth. The internal structure of Jupiter is also different. It has no solid shell and is a sea of liquid hydrogen in a dense atmosphere. Jupiter's interior is a solid core composed of iron and silicon, called Jupiter's core, with a temperature as high as 30,000 degrees Celsius.

Jupiter rotates very fast, and the rotation period of the equatorial part is 9 hours, 50 minutes and 30 seconds, making it the fastest planet in the solar system. Its axis of rotation is almost perpendicular to the track surface. Due to the rapid rotation, the oblateness of stars is quite large. With the help of a telescope, you can see that Jupiter is oblate. Jupiter revolves around the sun in an elliptical orbit at a speed of 13 km per second, and the half-length diameter of the orbit is about 5.2 astronomical units. It takes about 1 1.86 years for it to orbit the sun once, so the year of Jupiter is about 12 years of the earth.

Jupiter is a planet with more satellites in the solar system. So far, we have found that Jupiter has 16 satellites, which form a family with Jupiter: Jupiter system.

Special topic of solar system-earth, our home

What is the shape of the earth? Where is she from? As early as 6.5438+0.7 million years ago, human beings had all kinds of beautiful daydreams about their home-the earth, which were woven into many colorful legends. There is a story about Pangu's creation in ancient China. When talking about the creation of the world, ancient Greek mythology said that the universe was born out of chaos, and the first god to appear was Gaia, the god of the earth. The sky, land and sea are all born of her, so people respectfully call her "Mother Earth".

The earth has been the birthday star for 4.6 billion years, which originated from the primitive solar nebula. About 3-4 billion years ago, the most primitive single-celled life began to appear on the earth, and then gradually evolved, and various different creatures appeared. The average equatorial radius of the earth is 6378. 14 km, which is 2 1 km longer than the polar radius.

The internal structure of the earth can be divided into three layers: crust, mantle and core. Under the action of the earth's gravity, a large number of gases gather around the earth to form a blanket, which is the earth's atmosphere.

The earth is like a top, rotating from west to east along its axis of rotation. Her rotation period is 23 hours, 56 minutes and 4 seconds, which is about 24 hours. At the same time, the earth revolves around the sun, and its orbit is elliptical, with a half-length of 149597870 km. One revolution takes 365.25 days, which is one year.

Special topic of solar system-Venus dark neighborhood

Around dawn, a particularly bright "morning star" is sometimes seen on the eastern horizon, which is called "morning star"; At dusk, a very bright "evening star" sometimes appears in the afterglow of the west, which is called "Chang Geng Star". These two stars are actually one, namely Venus. Venus is one of the nine planets in the solar system, and it is the second planet in the order from near to far from the sun. It is the closest planet to the earth.

Venus is called "Taibai" or "Taibai Venus" in China. In ancient mythology, "Taibai Venus" was a god. The ancient Greeks called Venus "Aphrodite", the goddess representing love and beauty. The Romans called this goddess "Venus", so Venus is also called Venus.

Besides the sun and the moon, Venus is the brightest star in the whole day, with the maximum brightness of -4.4, which is 14 times brighter than the famous Sirius (the brightest star except the sun). Venus has no satellites, so there is no "moon" in the night sky on Venus, and the brightest "star" is the earth. Because it is close to the sun, the size of the sun seen from Venus is 1.5 times larger than that seen from the earth.

Some people say that Venus is the twin sister of the earth. Indeed, from the structural point of view, Venus and the Earth have many similarities. Venus has a radius of about 6,073 kilometers, only 300 kilometers smaller than radius of the earth, its volume is 0.88 times that of the Earth, and its mass is 4/5 of that of the Earth. The average density is slightly less than that of the earth. But the environment between them is very different: the surface temperature of Venus is very high and there is no liquid water. Coupled with cruel natural conditions such as extremely high atmospheric pressure and severe hypoxia, Venus cannot have any life. So Venus and the Earth are just sisters.

In the atmosphere of Venus, carbon dioxide is the most, accounting for more than 97%. At the same time, there is a thick layer of acid cloud up to 20 to 30 kilometers thick. The surface temperature of Venus is as high as 465 to 485 degrees, and the atmospheric pressure is about 90 times that of the Earth.

Venus's rotation is very special. Its rotation direction is opposite to that of other planets, from west to east. Therefore, on Venus, the sun rises in the west and sets in the east. It takes 243 days to rotate once, but the day and night on Venus are particularly long, which is equivalent to 1 17 days on Earth. This means that Venus only has two days in a year, and only two days can be seen in a year. Venus's orbit around the sun is an ellipse that is very close to a perfect circle. Its revolution speed is about 35 kilometers per second, and period of revolution's is about 224.70 days.

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Special topic of solar system-Saturn's most beautiful planet

Saturn is one of the nine planets in the solar system, and the sixth planet in the order from near to far from the sun. It ranks second in volume and mass, second only to Jupiter. It is similar to Jupiter in many ways and is also a "giant planet". From the telescope, Saturn seems to be a beautiful sun hat, floating in the vast universe. Its pale yellow and orange star is surrounded by colorful clouds, and its waist is wrapped with dazzling aura, which can be called the most beautiful planet in the solar system.

In ancient times, we called Saturn "the town star" or "the complement star", while the west called it Cronus. Both the East and the West associate this star with agriculture closely related to human beings.

Saturn is oblate, and its equatorial diameter is 654.38+200,000 kilometers, which is 9.5 times that of the Earth. The ratio of polar radius to equatorial radius is 0.965.438+0.2, and the difference between equatorial radius and polar radius is almost equal to radius of the earth. Saturn's mass is 95. 18 times that of the earth, and its volume is 730 times that of the earth. Although it is huge, its density is very small, only 0.7 grams per cubic centimeter.

Saturn's interior is similar to Jupiter's, with a rock core. Outside the core is a shell composed of 5000 kilometers of ice and 8000 kilometers of metallic hydrogen, and the outermost layer is surrounded by colorful clouds. Saturn's atmospheric movement is relatively calm, and its surface temperature is very low, about-140 degrees Celsius.

Saturn rotates obliquely around the sun at an average speed of 9.64 kilometers per second. Its orbit radius is about 65.438+0.4 billion kilometers, and its revolution speed is slow. It takes 29.5 years to go around the sun, but the rotation speed is very fast. The rotation period on the equator is 654.38+00 hours and 654.38+04 minutes.

Saturn's beautiful optical ring is made up of countless small celestial bodies, which revolve around Saturn on Saturn's equatorial plane. Saturn is also the planet with the largest number of satellites in the solar system. There are many large and small satellites around it, just like a small family. So far, a total of 23 have been found. The various shapes of Saturn's moons have aroused great interest among astronomers. Titan, the most famous satellite, has an atmosphere, and it is the only celestial body with an atmosphere among the solar system satellites found so far.

Special topic of solar system-Uranus in orbit

Uranus is a distant planet, ranking seventh in the order from near to far from the sun. In the west, Uranus is called "Uranus", and he is the first god to rule the whole universe. He combined with Gaia, the mother of the earth, and gave birth to later gods. He tried his best to make the chaotic universe harmonious and orderly. In Chinese, people translate this star name into "Uranus".

Uranus is a blue-green sphere with light blue-green luster and stripes that are not parallel to the equator, which is probably due to the atmospheric flow caused by the rapid rotation speed. Uranus has an equatorial radius of about 25,900 kilometers and its volume is 65 times that of the Earth. The mass is about 14.63 times that of the earth. Uranus has a small density, with an average density of 1.24 grams per cubic centimeter. Uranus' atmosphere is mainly composed of hydrogen, helium and methane.

Uranus' orbit is an ellipse with a radius of 2.9 billion kilometers. It orbits the sun at an average speed of 6.8 1 km per second. One revolution takes 84 years, but the rotation period is much shorter, only 15.5 hours. In the solar system, all planets basically follow the motion that their rotation axes are almost perpendicular to the orbital plane, except Uranus, whose rotation axes are almost parallel to the orbital plane, and the angle between the equatorial plane and the orbital plane reaches 97 degrees and 55 minutes, that is to say, it is almost "lying" around the sun. So some people call Uranus an "upside-down planetary world".

The alternation of day and night and the change of seasons on Uranus are also very strange and complicated. The sun shines on the North Pole, Equator, South Pole and Equator in turn. Therefore, every day and night in most parts of Uranus will last for 42 years before it can be changed once. On which pole the sun shines is summer, the sun never sets, and there is no night; The pole facing away from the sun is covered by long dark nights in cold winter. Only between 8 degrees north and south latitude near the equator of Uranus does the diurnal variation caused by the rotation period occur.

Uranus, like Saturn, has a beautiful light ring and a complex ring system. Its aura consists of 20 thin rings, each with a different color, colorful and beautiful. This discovery in the 1970s broke the traditional understanding that Saturn is the only ringed planet in the solar system. Uranus has 15 satellites, almost all of which are close to the equatorial plane of Uranus and revolve around Uranus.

Special topic of solar system-mysterious light blue of Neptune

Neptune is one of the distant planets, arranged from near to far according to the average distance from the sun, and is the eighth planet. Its brightness is only 7.85, which can only be seen by astronomical telescopes. Because of its light blue light, westerners call it Neptune, the sea god in Roman mythology. Translated into Neptune in Chinese.

Neptune's equatorial radius is 24,750 kilometers, which is 3.88 times that of the Earth. Neptune is oblate, its volume is 57 times that of the Earth, its mass is 17.22 times that of the Earth, and its average density is1.66g per cubic centimeter. Neptune is the third largest planet in the solar system, second only to Jupiter and Saturn.

Now people think that Neptune has a core with a mass similar to that of the Earth. The core consists of rocks with a temperature of about 2000 to 3000 degrees Celsius. The core is surrounded by thick ice and dense atmosphere. The atmosphere mainly contains hydrogen and methane, ammonia and other gases. Neptune is a world where the wind is howling in cloud flying, and there are many turbulent cyclones rolling in the atmosphere.

Neptune's rotation period is about 22 hours, and the angle between its equatorial plane and its orbital plane is 28 degrees and 48 minutes. Neptune's orbit around the sun is very close to a perfect circle, and the angle between the orbital plane and the ecliptic plane is very small, only 1 degree 8 minutes. It orbits the sun at an average speed of 5.43 kilometers per second, which takes about 164.8 years, from 1846.

In the four seasons of Neptune, the temperature difference between winter and summer is very small, which is not as obvious as that of the earth. Because Neptune is too far away from the sun (about 450 million kilometers, 30 times the distance between the earth and the sun), the solar radiation per unit area on its surface is only 1/900 of that on the earth, and the solar intensity is only equivalent to the light intensity emitted by a 100 watt bulb less than one meter away, so its surface temperature is very low, usually below MINUS 200 degrees Celsius.

So far, Neptune has been found to have eight moons.

Special topic of solar system-the farthest planet Pluto

Among the nine planets, Pluto is the planet with the farthest average distance from the sun and the smallest mass. It hobbles in the space 5.9 billion kilometers away from the sun. In the west, people call it Prouteau, the god of the underworld in Roman mythology, which is translated into Pluto in Chinese.

Pluto's mass is 0.0024 times that of the Earth, its volume is 0.009 times that of the Earth, its equatorial diameter is about 2400 kilometers, and its average density is 1.5g/cm3. It is the smallest planet in the solar system, not as big as the moon.

Pluto is too far away from the sun and receives little solar radiation, so the surface temperature is very low. It is estimated that the average surface temperature is below MINUS 200 degrees Celsius. At such a low temperature, most substances have condensed into solid or liquid, and only hydrogen, helium and neon may be gaseous. So Pluto is extremely thin and transparent if it has an atmosphere.

The period of revolution of Pluto is 248 years. Its orbit around the sun is very strange, it is an oblate ellipse with an eccentricity of 0.25. Pluto is only 4.3 billion kilometers from the sun, which is closer to the sun than Neptune. It can reach 7.2 billion kilometers when it is farthest from the sun. In addition, the orbits of the eight planets around the sun are basically in the ecliptic plane, and the angle between Pluto's orbit and the ecliptic plane is about 17 degrees, so Pluto sometimes runs above the eight planets and sometimes runs below the eight planets. Pluto's rotation period is relatively long, about 6 days and 9 hours. According to the data of Pluto satellite, it is estimated that the angle between Pluto's rotation axis and its rotation axis is greater than 60 degrees, so it is lateral rotation, similar to Uranus.

At present, Pluto has only one satellite, called Chalong. Period of revolution of Chalong has the same rotation period as Pluto, which is 6.39 days. Such a satellite, also called a synchronous satellite, is the only natural synchronous satellite in the solar system. Therefore, on Pluto, it is a big "moon" that is still. Chalong is 850 kilometers in diameter, which is one third of Pluto's. For Pluto, which is not too big, this satellite is indeed a bit surprisingly big.

Special topic of solar system-looking for the tenth planet

How many planets are there in the solar system? We now know that there are nine planets in the solar system. Mercury is closest to the sun, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto from inside to outside.

The understanding of the nine planets in the solar system has a long history. In ancient times, people could only see Mars, Venus, Mars, Jupiter and Saturn in the sky. In ancient China, Venus was called Taibai, Jupiter was the age star, Mercury was the morning star, Mars was the fluorescent star, and Saturn was the filling star or the town star.

In foreign countries, the names of various gods in ancient Roman mythology have become the names of the stars. For example, Mercury is the merchant god MacQiuli, Mars is the god of war in Mars mythology, Jupiter is the god of love, and Venus is the pioneer and messenger of Apollo, the sun god. 1543, the polish astronomer Copernicus founded the "Heliocentrism", which made the sun replace the earth as the "center of the universe". Only then did people know that the earth where they lived was a planet in the solar system. Since then, astronomy has given the name "solar system", and planets in the solar system have been discovered continuously.

178 1 year, the British astronomer William Herschel discovered Uranus;

1846, Neptune was discovered in Ledangsi, England and Levell, France.

1930, Tombaugh, a young astronomer at Lowell Observatory, discovered Pluto. So far, nine planets have been discovered in the solar system.

The nine planets in the solar system, nine brothers born of one mother, not only arrange regularly, but also compete in the same field like runners, and revolve around the sun in the same direction along their respective runways in a very orderly manner. Although some of them run fast and some run slowly, they never compete for the runway.

Is there a tenth planet in the solar system? This is a mystery. Many scientists have been looking for the tenth planet for a long time.

Scientists believe that the tenth planet cannot be found in the orbits of the nine planets at present, and it can only be found in the orbit of Mercury or outside the orbit of Pluto. The former is called "inner planet" and the latter is called "outer planet".

Scientists have been trying to find planets in water since the last century. Although some found some "clues", after many scientists' investigations, they did not find the side of the underwater planet for field observation. 1976, the United States launched a spacecraft to search for a whole year, and found no traces that could prove the existence of underwater planets. From this point of view, the possibility of planets in water is very slim and can even be completely ruled out.

Scientists have also done a lot of work in the search for extraterrestrial planets. According to the observation data, astronomers believe that if there are extraterrestrial planets, they may be 5-105 kilometers away from the sun and their mass is about 5- 10 times that of the earth. 12 now, scientists have used super-large telescopes to aim at the possible places of this unknown planet and taken tens of thousands of photos, hoping to find something like gold in the sand from these photos. In addition, the space probes Pioneer 10 and 1 1 launched by the United States made a lot of observations near the edge of the solar system, trying to find extraterrestrial planets. 1On July 9, 987, the main researcher of the American Pioneer space probe said that there may be a tenth planet in the solar system, but its orbit is unusual, almost inclined at right angles to the orbits of other planets. The mass of this planet is four times that of the Earth, and it will take period of revolution at least 700 years.

Is there a tenth planet in the solar system? So far, there are different opinions, and it is still a mystery with no definite answer. I look forward to the long-term observation and answer in the future. Maybe this mystery will be solved by you.