Hi Sharon, this is aam1234. I left the "dust" there on purpose to make it feel/look like it's the heavens, which it is (and these are not sensor dust).
Beautiful, Armin! I am so jealous you got to see it! Is the white smudge to the left of the sun a cloud? It looks like you have some sensor dust in the blue part that would be easy to clone out. Good work! ~Sharon