So I'm reading "In Search of Schrödinger's Cat" by John Gribbin, a delightful and concise history of modern physics and I was reading about spectral lines and it said that the dark lines in the solar spectrum can be explained by the fact that there's a cooler cloud of element(s) X around the sun that absorbs those frequencies from the white light by the sun. I understand what it says, but it brings up two (related) questions for me: 1) What if someone brought up the hypothesis "The dark lines are there NOT because there's a cooler cloud of X around the sun, but because X is missing inside the sun (and so are all other element(s) with some of those characteristic frequencies) so the 'white light' the sun emits simply never had those lines/frequencies to begin with," how would one debunk that? The book is not clear on why that is not possible. 2) What is light white actually? If the sun really sends out white light (before reaching the cloud of X), does that imply it has a MASSIVE collection of different types of elements so that all the spectral lines of the individual types add up to make the whole visible spectrum? That seems implausible... Is there another way of creating white light besides adding up spectral lines of specific elements? And what method is used in laboratoria for absorption spectra tests? (side-Q: the fact blue+red+yellow = white is not talking about the same white, is it? This is more like a psychological white that has little to do with the white previously talked about, correct?) Thank you!