You put your finger on a crucial point -- what is the source of the illumination of the particles? In the prosaic model, they are just sunlit. In non-prosaic models, they are self-illuminating, as your words suggest. So the question is always, with such videos -- was the sun 'out', or not? It's not as easy as one might think to determine this based merely on the scene. Stars can be 'out' in daylight, in the vacuum of space. The Earth below can be still dark, if it's soon after orbital sunris
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