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| Base Info | |
| Term | Solar System |
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| Related Articles | Sun |
The solar system is a planetary system bound by the gravity of the sun, including the sun and celestial bodies that move directly or indirectly around the sun.
Introduction
The solar system is centered on the sun, and the collection of all celestial bodies bound by the sun's gravity. The Sun is the main source of light on all planets in the solar system.
The sun occupies 99.86% of the known mass in the solar system, of which approximately 98% is composed of hydrogen and helium. Most of the solar system is close to a vacuum, and only interplanetary matter is known.
Other than the sun
The celestial bodies surrounding the sun are divided into three categories[note 1]: planets, dwarf planets and small solar system bodies.
Planets: According to the rules adopted by a vote at the Astronomical Congress in 2006, they must meet three conditions at the same time (revolving around the sun, being elliptical (so-called hydrostatic equilibrium), and being able to clear space objects near the orbit).
- Rocky planets: Mercury, Venus, Earth (Gaia), and Mars.
- Gas giant planets:Saturn, Uranus, and Neptune.
- Mercury, Venus, Mars, Jupiter, and Saturn have been discovered in ancient times, and people at that time realized that their movement (as seen from the Earth) was different from other stars, so a distinction between "planets" and "stars" was made (but due to the limitations of people’s knowledge at that time, the Sun and Moon were also regarded as planets).
- Uranus and Neptune were discovered only in modern times.
Dwarf planets: Meets the first two conditions but not the third. They are mainly found in the asteroid belt and Kuiper belt.
- Ceres, Haumea, Makemake, Eris.
- Pluto has long been regarded as the ninth planet, but later it was confirmed that its mass is very small, and celestial bodies with greater mass than Eris were discovered, so the academic community decided to expel it from planet status, naming it as a dwarf planet.
Related works
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Notes
- ↑ In fact, there is no celestial body orbiting around the center of the sun. The two celestial bodies will revolve around each other around the center point formed by each other's center of mass. But because the center point is often inside the larger one, it looks like the smaller object is orbiting the larger one.