Eli5 Why was the sun made up of mainly just hydrogen when it was formed compared to inner planets that have so many more elements, especially higher ones?

Question

All,

I have a basic understanding that a lot of elements were brought to planets by comets, supernova explosions and so on.

Why didn’t the sun attract most of these comets and fragments from celestial explosions instead of the planets? And why was / is the sun mainly just hydrogen?

In: 105

Answer 1

Because the Universe is mostly made
up of Hydrogen, some Helium and a bit of Lithium. Three elements, that’s it. That is the total of what was created immediately following the big bang.

Everything else was created by the various different stars in their different stages of life.