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They are usually microscopic so you could see them with a microscope. This type of thing can be seen all over the world. It just doesn't happen all the time everywhere like a sunset.

Thank you for clarifying, I'll keep follow your posts so hopefully I can see more of this, because I really liked it. Btw I just meant to ask if they are everywhere or just specific geographic areas. So I guess I've been just unlucky so far.. 😔 may be the fact that is more rare to see than a sunset is precisely what makes it more special than any sunset.