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

The sun actually has similar composition to other planets in the solar system. Jupiter and Saturn are basically suns that are not heavy enough to undergo fusion. Other planets do not have this hydrogen because it was blown away by solar winds long time ago.The sun is mainly hydrogen because the universe is mainly hydrogen.