It's not just human society that provides des res and, for that matter, those areas that are known as sink estates. Apparently the Universe is full of both and the distance between them is somewhat larger that anything we know.
According to the Fermi Catalogue (no I hadn't heard of it before either. It's not one that normally comes through my letter box) there are some bad areas in the universe. No one knows quite why that is so. Some they know are caused by gamma rays but for many of the others there seems to be no gamma source so the reason...? No one knows.
But is it such a great mystery in our own part of the universe?
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