Our Solar System _______________________________________________________________________________________________________________________________________________________________________________________________________________________
6. Revolution
Our 8 planets, asteroids, comets, and some other solar system bodies revolve around the sun in an orbit.
This is due to the explosion and gravitational collapse of a giant cloud formed a system called the solar system in which our sun, 8 planets and their moons, dwarf planets and their moons, asteroids, and other bodies exist. Initially, these bodies have velocity due to the explosion in a certain direction.
The gravity of the Sun pulls these planets towards the center of the Sun but the velocity of these planets is perpendicular to the force of the sun’s pull. This makes an equilibrium between the force of the Sun’s gravitational pull and forces developed by the planet’s initial velocity.
All the planets, seen from the Celestial North Pole, go anticlockwise around the Sun (in the opposite direction to the hands of a clock).
A year is the period of time required for one planet to make one complete trip around the sun. For the earth, the period is about 365¹/₄ days.
The video shows a simple 2D animation of planet movement during 4 years with approximate orbital speed ratio.