The Sun

 It is like saying that the value of the eye is not known when we have eyes..

From the blade of grass on earth to humans, this sun is necessary for life to exist. All the energy sources we use are directly or indirectly contributed by the sun. 

Have you remembered how all this energy is generated in the sun..??

Imagine a hydrogen balloon with a temperature of 1.5 crore degrees Celsius. 

Due to this high heat and pressure, the hydrogen atoms in it are so crowded that they cannot even breathe. 

When you say crowded, there is no room for a single particle...!! Then what will you do? There is only one way. They must merge with each other..

Thus, four hydrogen atoms combine together to form a helium atom. 

Then there is another problem. When you weigh these four hydrogen atoms together, the helium atom formed from them is slightly lighter..!!  Well.. Einstein Sir gave a formula to the scientists who were confused about where the rest of the mass went; E=mc². That is, the rest of the mass that should have been left has been converted into energy..!!

This energy is what sustains life on our earth as kinetic energy and heat.🌞

Let's put it a little more simply.. In one second, 600 million tons of hydrogen fusion occurs and turns into 596 million tons of helium.

This remaining 4 million tons is being converted into energy.. !!