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Thanks for an interesting post. The field of astronomy moves so fast. I remember some 30 years ago hearing a talk by one of the astronomers from ?Mt Stromolo/AAT? about a gigantic trail of gas in non-visible wavelengths that arcs across the sky as evidence of a previous interaction between the LMC and SMC. Supposedly the vectors lined up. Reading your post my first thought was that maybe there is a visual component to this gas trail, but if the galactic cirrus is foreground, as you suggest, I guess that would not be the case. But then I wonder how distances to gas clouds are determined if they don't actually contain any stars?
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