Sun

The sun is the center of the solar system. The sun is the largest object in solar system.
It is diameter ia approximately 1,4 million kilometer it consists of hydrogent and helium.
The sun is 333.000 times as massive as the earth is.

The sun does not revolve around the Earth but vice-versa. Why does this happen ? Because the sun ‘s mass is so massive compared to the other object in the solar system. More than 99% of the mass of solar system is centered on sun, so that the celestial object revolve around the sun.There for it is reasonable that the Earth revovlve around the sun, not vice-versa If the rotationl objects system is seen from a reference at rest at large distance away., then the objects system will rotate to the center of gravity

A star is a self-luminous celestial body. The Sun is the closest to the Earth eith a distance of about 149.600.000 km

Why can a star make its own ligt ?  For file Download SUN <<<< Physics education for Junior High School SUN