I have read on a NASA website amongst other places that "Many astronomers believe that Seyfert galaxies and high-energy quasars are basically the same type of objects, but we are simply viewing them differently". But on the same website it also says that "by measuring their redshifts, we find that Seyferts are much closer to us than quasars or blazars." But if they are the same things, why do we not see find them at the same redshifts? Is it just because Seyferts for example are not energetic enough that we can detect them at high redshifts? Thank you, kop442000.