There are an estimated 9 billion trillion stars in the universe (source:wiki). How would you fit all of them just a few thousand miles away from earth?
We don't know the exact size of stars. We can only guess their diameter. There is a theory that the diameter of the sun is only 32 miles. Though others think millions or hundreds of thousands. All of this is guesses and assumption. Unless someone lands or gets close to the Sun, we won't know.