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Originally Posted by Jerry Jensen
Nothing is transparent. There should be radiate backwash at the extended boundary between the solar system and the rest of the galaxy. The question is only how much, and in what frequency bandwidth. The simple radiation transfer models I worked with a few years ago created a blackbody in the microwave range, but I did not have real data to work with. I am hoping to find some numbers on the particle counts and energy densities the Voyager probes are encountering.
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This is complete nonsense. Even if whatever is doing the microwave emission emits as a perfect blackbody, it still does not amount to a perfect blackbody SED without the source being completely opaque. We wouldn't see a thing beyond terminal shock at FIRAS frequencies. At best you could make it a blackbody in the same sense the troposphere is a blackbody, but there is no way whatsoever you can justify a 99.995%+ blackbody as required by FIRAS limits without throwing standard radiative transfer physics out of the window.