'Bubbles' could imply something like space-time changes, and in face a couple of comments speculatively / hopefully read them like this: [1], [2]
But they're (sadly?) much simpler: Spitzer bubbles 'are formed by radiation and winds from massive stars, which carve out holes within surrounding dust clouds.'
So really just the blast radius!
-- https://www.spitzer.caltech.edu/image/ssc2013-05a1-bubbles-w...
I would _love_ it if either of both these comments were true, by the way. Space-time can be boring and restrictive. What if...? I love the idea of bubbles reflecting a smaller universe and what it might hint about FTL, for example, and I live in hope that we'll find abberations and abnormalities like this.
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