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I think you might be commenting on a thing that I often muse over.
M57 is supposed to be a sphere of gas. But we see it as a cross section. Why is the center free of gasious nebulosity? It appears as a hollow sphere, cut in half!
A boiled egg sliced up; ok guys come clean , who took the yolk out?
Hope I have not missed your point.
cheers,
Doug
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