The Sun is the center of the solar system. The mass is more than 750 times as great as that of all of the planets combined. The hugemass of the sun creates the gravitationthat keeps the other object traveling around the sun in an orderly manner. The Solar system has a circular shape. It is only tiny part of a galaxy called the Milky Way.
Planets are the second largest objects in the solar system.
Those four planets are called terrestrial. The four largest planet is Jupiter, Saturn,Uranus and Neptune are called the major planets. Asteroids,also called plantoids ,are small,irregularly shaped object made of rock or a metel or a mixture of the two substance. Meteorids are small chuck of iron and rock thought to result from collision between astorids. Coments, and small bodies that move around the sun.