The above article gives you the science of what stars (sun) are. Today I bring you the 8 children that are the most loved by planets and the sun.
1: What is a planet?
planets usually cannot shine themselves, but they will move around the stars and rotate. It cannot undergo nuclear fusion reaction like stars. The planets themselves generally do not shine, and they shine with their surface reflecting the light of the star.
must revolve around the sun, with a large diameter and mass enough that there is no larger object near the orbit than him.
2: 8 major planets
Currently, there are 8 planets in the solar system.
is: Mercury, Venus, Earth, Mars , Jupiter , Saturn , Uranus , Neptune , Neptune .
3: There were 9 planets in the past. Why did Pluto be kicked out 8 planet ?
1930 was discovered by the famous American astronomer Tang Bo .
Discoverer Tombo mistakenly estimated the mass of Pluto, believing that Pluto's mass exceeds that of Earth. In fact, Pluto is not as big as the earth, nor is it even as big as the moon.
Because it is too small, it was kicked out of the planetary family and relegated to a dwarf planet in the solar system.
3: Mercury
is closest to the sun and is the planet with the smallest mass and size in the solar system.
temperature difference is the largest in the entire solar system.
The fastest-revolution planet (cause of the sun's gravity). It takes about 365 days for the Earth to orbit a week, while Mercury only takes 88 days.
, but Mercury's rotation period is very long, 58.65 days
Mercury is often hidden in the sun's light and often appears at the same time as the sun. In ancient China, it was called " Chenxing ". There is no protection atmosphere, no life.
has no satellites, its mass is too small and it is too close to the sun. According to the principle of gravity, objects with too small mass cannot constitute enough gravity. Even if there is satellite , it will be taken away by the powerful attraction of the sun
Sima Qian From actual observations, it was found that the star of Chen is gray, which is associated with the theory of the Five Elements. It is named Mercury after black belongs to water.
Mercury
4: Venus
Venus is the brightest star except the sun and the moon, and the most temperature planet in the solar system.
has no satellites. Explore first. The slowest rotation. The only one that reverses.
The sky of Venus is orange-yellow, mainly composed of carbon dioxide , and the atmospheric pressure is 92 times that of the earth, which is equivalent to the pressure at a depth of 1 kilometer in the earth's ocean.
nickname Taibai. The only planet without a magnetic field, people say he and the Earth are sister stars, carbon dioxide and sulfate rain clouds.
Venus is slightly smaller than the Earth (95% of the Earth's diameter, 80% of the Earth's mass)
Venus
5: Earth
Our survival home, and the only planet in the solar system that has life
Due to scattering, the Earth appears blue, and is called the "blue planet"
The natural satellite of the Earth is the moon and the only natural satellite on Earth.
and the moon system together.
Earth
6: Mars
It is considered the second smallest planet in the solar system (except Earth) after Mercury. desert planet , lacks plate movement, so there is no greenhouse effect . The atmosphere is mainly carbon dioxide. Mars has two natural satellites,
. The volume and mass of Mars are very similar to that of the Earth, but there is no ocean on the surface of Mars, but there is a large amount of iron oxide . The iron oxide is reddish-brown, so the whole Mars is also orange-red, so Mars is called the "red planet".
Its orange-red appearance is because the surface is covered by hematite (iron oxide), and the diameter of Mars is about the Earth. Half. The closest distance is about 55 million kilometers from the earth, and the farthest distance is more than 400 million kilometers. The close contact between the two occurs approximately every 15 years
mars
7: Jupiter
In ancient China, it was called the Sui Star because it was exactly 12 years. Jupiter and Saturn were huge in size and large in mass, but had a small density, mainly composed of light elements such as hydrogen, helium, and neon.
Juste is the largest mass among the planets in , the gas giant planet , which is not composed of rocks or other solids as the main components.
Jupiter is the planet with the most natural satellites in the solar system, with as many as 66 satellites.
is the fattest, but also the most flexible, with the fastest rotation. gas planet is not mainly solid, and it rotates too fast, so it is flat, with a very large magnetic field, 14 times the earth, with a large volume and a large gravity, blocking many foreign celestial bodies for the earth.
Juste
8: Saturn
In ancient China, it was called Zhenxing or Filling Star. Saturn rotates very quickly, second only to Jupiter. Due to its rapid rotation, its shape becomes flattened, making it the flattest among the planets in the solar system.
has its own halo, which is too far away, so it is cold. The halo is composed of 300,000 kilometers of solid ice. Because it has gravity, it forms a circle, and the light cannot shine in and the wind speed is the highest.
Saturn
9: Uranus
The coldest planet in the solar system, lying horizontally orbiting the sun. The cover image shows the photo taken by Voyager 2 when it flew over Uranus recently
Uranus also has its own characteristics. Most planets always rotate around an axis that is almost perpendicular to the 5th plane of the eclipse of the eclipse of the eclipse, but the axis of Uranus is almost parallel to the eclipse. Therefore, Uranus's South Pole is almost directly exposed to the sun, so Uranus is the only planet in the solar system that rotates lying and rotating.
The laziest, other planets are standing around the sun, only he is lying, the North and South Poles face the sun, and they have been walking around for 1984. Why are they lying? It may be the result of attracting each other with other planets.
Uranus
10: Neptune
Because it is too far away, only one spacecraft Voyager 2 visited Neptune on August 25, 1989. Almost all we know about Neptune comes from this brief meeting.
The blue color of Neptune is caused by the absorption of red light from sunlight in the atmosphere by methane .
The storm on Neptune is the fastest in the solar system.
Apart from the earth, the blue planet is the farthest and coldest, with a layer of ice on the surface, like a diamond.
Nehren
