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Even if there was dust in the ice matrix, you’re not sublimating the ice, you’re just rearranging the ice and then letting (hydrogen) get released. So, the dust isn’t even going to come out, what’s beautiful about Jenny’s idea is that it’s exactly what should happen to interstellar comets. We had all these stupid ideas, like hydrogen icebergs and other crazy things, and it’s just the most generic explanation.