Why doesn’t the Sun explode with it being mostly hydrogen?
The Sun doesn't explode because it's got a balance between two forces: gravity and fusion.
Gravity pulls all the gas in the Sun together, but fusion makes energy that pushes the gas out.
So the Sun is like relaxing in a stable state.
Now, fusion is when hydrogen atoms smash together and make helium atoms, plus some energy.
This happens in the core of the Sun, where it's super hot and dense. But fusion is not like a bomb that goes off all at once.
It's more like a slow cooker that keeps the Sun warm for billions of years.
The Sun is not massive enough to explode like a supernova, which is when a star runs out of fuel and collapses under its own weight.
Then the core bounces back and blows up the outer layers.
The Sun will never do that, it will never fuse anything heavier than helium.
When it runs out of hydrogen, it will just swell up into a red giant and then shrink down into a white dwarf.
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