The prologue narrator refers to stars and regions of gas between them, then says that "the starlight makes the gas transparent, and where there are no stars, it appears as dark obscuring clouds." Transparency is actually caused not by starlight but by the absence of dust; starlight will either have no effect on the appearance of gas, or will cause it to be illuminated or, perhaps, to fluoresce. Dark, obscuring clouds are those that contain dust and are not illuminated.
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05/03/2025 alle ore 07:43
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