What are the eight planets?

Generally speaking, a planet must be more than 800 kilometers in diameter and more than 500 million tons in mass. According to this definition, there are currently eight planets in the solar system. Let's see which eight.

0 1 mercury (? )

Among the eight planets in the solar system, Mercury is the closest planet to the sun. China, known as Chen Xing in ancient times, has the largest orbital eccentricity among the eight planets, smaller than Pluto. It orbits the sun once every 87.968 Earth Days and rotates once every 2.0 1 for 3 times.

02 Venus (♀)

According to the order from near to far from the sun, it is the second one, which is 0.725 astronomical unit from the sun. It is the closest planet to the earth (Mars is sometimes closer). The ancient Romans called it Venus, China called it Chang Geng, Qi Ming, Taibai or Taibai Venus, and Aphrodite in ancient Greek mythology. Period of revolution is 224.7438+0 Earth Day.

03 the earth (? )

It ranks third in the order from near to far from the sun, and it is also the earth-like planet with the largest diameter, mass and density in the solar system, with a distance of 65.438+0.5 billion kilometers from the sun. The earth rotates from west to east and revolves around the sun at the same time. At present, there are 4-4.6 billion years old, and there is a natural satellite on the earth? The moon, the two constitute a celestial system? Earth-moon system. It originated from the primitive solar nebula 4.6 billion years ago.

04 Mars (♂)

It is the fourth planet in the solar system from the inside out, belonging to the earth-like planet, with a diameter of about 53% and a mass of 14% of the earth. Due to the axial tilt, the rotation period is similar to that of the earth, and one circle is about twice that of the earth. The orange appearance is the surface hematite (iron oxide). China's ancient book is called Mars? Fluorescent star? The ancient west (ancient Rome) was called Mars? Mars myth star? Aries, the only ruler of the twelve constellations, is not the ruler of Scorpio.

05 Jupiter (? )

It is the largest and fastest rotating planet among the eight planets in the solar system and the fifth planet from the inside out. Its mass is one thousandth of that of the sun and 2.5 times that of the other seven planets in the solar system combined.

Saturn (? )

The distance from Japan (from near to far) is the sixth. The mass and diameter are second only to Jupiter, and they belong to the gas giant planet with Jupiter. Saturn in ancient Europe (ancient Greece) was Cronus (ancient Greece:? ; English: Chronos), China was called Zhenxing in ancient times.

07 Uranus (? )

It is the seventh planet in the solar system from the inside out (18.37~20.08 astronomical units). It ranks third in the solar system (larger than Neptune) and fourth in mass (smaller than Neptune), and it revolves around the sun almost horizontally.

Neptune (? )

It is a distant planet among the eight planets in the solar system. According to the distance between the planet and the sun, Neptune is the eighth planet, the fourth largest planet in diameter and the third largest planet in mass. Neptune's brightness is only 7.85, which can only be seen by astronomical telescopes.