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I'm going to interpret your question a bit liberally - you ask for the case where we ignore the Sun; I'm going to go a little bit further and ignore the entire galaxy (and in fact other nearby galaxies) and talk about the cosmic background radiation. The cosmic microwave background gets a lot of attention, but in fact there are cosmic backgrounds at a very ...


EDIT: Now that the question has been reformulated, this isn't the actual answer (it gives the value of the average detected wavelength) Two assumptions: We're looking for some average values in the cosmos, not the specific value we get here on Earth (since the sun messes the whole calculation up) We're looking for the average wavelength, not the most ...

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