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Originally Posted by beppe
To know how light is dispersed you must know what it was when was emitted.
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But you do know that. The extinction lines in a star spectrum have pretty narrow and well-defined wavelengths, so you'll know how the spectrum was shifted in transfer. Knowing the theory of stellar evolution, you'll know which kind of spectrum to expect. So, you do know what's been emitted.
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Do you think that an effect of -50 dB could be resolvable with all those approximations and assumptions?
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The effect we're talking about here was measured under wholly different circumstances. Keep in mind that we're
not seeing faster neutrinos from supernovae, but only in the measurements done at CERN and Gran Sasso.