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Jul 7, 2020 at 6:29 comment added SoronelHaetir Depending on exactly how far away you are trying from I would think quasars would present the additional difficulty of not being stable over astronomic scales. That is, a galaxy that is a quasar 'now' as viewed from MW may not be if viewed from 1GLY away even if we magically wave away the nowness issues.
Apr 17, 2015 at 23:35 history answered BrettFromLA CC BY-SA 3.0