Understanding solar system

The solar system is a composition consisting of the sun as the center and the planets and other heavenly bodies moving around. The sun is the center of the solar system. Sun consisted of glowing gas and very hot.Celestial objects that emit light called a star, while the celestial bodies that reflect light called a planet. Each planet has a gravitational force so that the planet does not move away from or closer to the sun. Planetary orbits or trajectories elliptical or ellipse. It is called the orbit trajectory. The existence of each planet's orbit makes it does not collide with each other. Accompaniment planet called satellites.