The solar system is a celestial system composed of the sun, planets and their satellites, asteroids, comets, meteors and interplanetary materials. 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 nine major planets and tens of thousands of asteroids account for a negligible proportion. They revolve around the sun along their own orbits for eternity. At the same time, the sun generously and selflessly contributes its 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 in order outward by Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. Among them, only five can be seen with the naked eye. Countries have different names for these five stars. Ancient my country had the Five Elements Theory, so they used the five elements of gold, wood, water, fire, and earth to name them Venus, Jupiter, Mercury, Mars and Saturn are not so called because there is water on Mercury and trees on Jupiter. In Europe, they call them after Roman mythological characters. The three far-solar planets discovered in modern times are called in the West by the names of the God of the Sky, the God of the Sea, and the God of the Underworld in accordance with the tradition of naming them after mythical figures. In Chinese, they are translated as Uranus, Neptune, and Pluto accordingly.
The nine planets and the sun are ordered from largest to smallest in size: the sun, Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury, and Pluto. They can be roughly divided into three categories according to standards such as mass, size, chemical composition, and distance from the sun: terrestrial planets (Mercury, Venus, Earth, Mars); giant planets (Jupiter, Saturn); aphelion planets ( Uranus, Neptune, Pluto〉. They have the characteristics of surface, isotropic, and nearly circularity during revolution. 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 extraterrestrial visitors - meteors.
Mercury 58 000 000 kilometers
Venus 108 000 000 kilometers
Earth 150 000 000 kilometers
Mars 228 000 000 Kilometers
Jupiter 778 000 000 kilometers
Saturn 1 427 000 000 kilometers
Uranus 2 870 000 000 kilometers
Neptune 4 497 000 000 kilometers
(Pluto 5 914 000 000 kilometers)
Astronomical unit: Consider the 150 million kilometers from the Earth to the Sun as one astronomical unit (AU ).