Basic overview of the solar system?

1.The solar system and the celestial body system that takes the sun as the center and is dominated by its gravity and moves around it are called the solar system.The members of the solar system include the sun and the planets surrounding the sun(such as mercury,Venus,earth,Mars,Jupiter,Saturn,Uranus,Neptune),more than 2000 asteroids with determined orbits,a large number of satellites,and a large number of comets and meteoroids.The sun and its planets were born at the same time.They were formed by a huge mass of gas and dust 4.6 billion years ago.Inside,gravity gradually ends the disordered state of matter.In the center of the air mass,the temperature gradually rises,and when it reaches a certain high temperature,the sun forms.Some small matter masses also formed and revolved around the center,which are planets,comets and their respective moons.In the early days of the earth,the sun was different from today.When life began on earth 300 or 500 million years ago,the sun was different from what it is now.On the surface,the sun is light yellow,8%to 10%smaller than now,and the brightness is only 70%to 75%of now.Since then,the sun has slowly grown larger,hotter and brighter,lasting 300 to 500 million years,but it is not comparable to the"greenhouse effect"that lasted only one to two centuries.
2.In the next five billion years,the sun will remain stable.In the future,the sun may be slightly larger,hotter and brighter than now due to the combustion of hydrogen.After that,the earth will change a lot.Five billion years later,the helium core of the sun became larger and larger,and finally collapsed,burning into carbon,and the hydrogen on the surface continued to be converted into helium.The energy generated by the helium combustion reaction will push the photosphere outward,and the sun will become a red giant star,swallow mercury and Venus,and reach earth orbit.The red surface of the sun is still,but it will get colder and colder.The earth will still be melted by the heat of the sun.
3.The nine planets in the solar system are Mercury,Venus,earth,Mars,Jupiter,Saturn,Uranus,Neptune and Pluto in order of distance from the sun.Their average distance to the sun conforms to the Titus bode rule.According to their different properties,they can be divided into three categories:Earth like planets(mercury,Venus,earth and Mars)have smaller volume and mass,the highest average density and fewer satellites;Giant planets(Jupiter and Saturn)have the largest volume and mass,the smallest average density,many satellites,planetary rings,and can emit infrared radiation by themselves;The volume,mass,average density and the number of satellites of the distant planets(Uranus,Neptune,Pluto)are between the first two,and Uranus and Neptune also have planetary rings.The nine planets all revolve around the sun in the same direction on a nearly circular elliptical orbit close to the same plane,that is,the orbital motion of the planets is coplanar,nearly circular and isotropic,and only mercury and Pluto deviate slightly.The rotation direction of the sun is also the same as that of the planet.The rotation cycles of earth,Mars,Jupiter,Saturn,Uranus and Neptune are all about 10-24 hours,but the rotation cycles of mercury,Venus and Pluto are 58,6,243 and 6,4 days respectively.Most major planets rotate in the same direction as their revolution,but Venus rotates in the opposite direction,while Uranus rotates laterally at a small angle between its rotation axis and its orbital plane.Except mercury and Venus,other big planets have their own moons.