Why doesn't the sun burn out

Why doesn't the sun burn out ???
Why ?
Have you ever thought ???
Why doesn't the sun burn out??
When you don't put fuel in fire ,flames will die. Isn't it ?
The Sun is burning non stop for 5000 million years.
So what makes the Sun burning without stopping?
Sun is composed of 75% Hydrogen and 25% Helium Gas
In the center of the Sun Hydrogen is 
compressed with such a force that is started nuclear reaction. 

Then further Hydrogen converts into helium.
So the Sun is burning and creating fuel at the same time.
When hydrogen goes out it get filled with helium.
The Sun has enough hydrogen to keep the fire going for another 5000 million years.
So just chill you are safe
2018


Why doesn't the sun burn out ???
Why?
Thank You 
For 
Watching


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