The sun is a self-illuminated star. Its diameter is $13, 92,000 \ km.$
Which is $109$ times the diameter of the Earth. The sun's gravitational force is $28$ times greater than that of the earth.
The temperature on the outer surface of the sun is about $6000\ C$ while the temperature in the center part is about $1, 50,000,000^\circ C.$ supposed to be as much.
Enormous heat and energy are generated due to the nuclear reaction taking place in the center of the sun.
This hydrogen gas generates tremendous heat and energy to convert the particles into helium gas.
This heat energy and energy is called solar energy. The burning of $12000$ billion tons of coal per second from the sun emits the same amount of energy.
Only two billion of them reach the earth's surface. All living things on earth are surviving because of this energy. So he says whatever the foster father of the living.
The black spot that appears on the surface of the sun is called sunspot. Which are cracks on the surface of the sun. In which the internal heat of the sun comes out.