Wow, what a fantastic response Dana! You have answered quite a few of my questions and posed a few more. I'm going to have to read your reply quite a few times and do a bit of searching to try to understand all of your comments.
Is part of the reason that the northern side is so busy due to it being rotated closer to the Milky Way and the SW side tilted away from it?
More questions to come as I generate enough incomprehension to ask them.
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