One planet per galaxy that can't physically escape it with intelligent life that can perceive this universe cognitively sounds like the multiverse layout where one galaxy is one version of the other but infinite of them all coexisting in the same dimension simultaneously far away with no way of contacting one another living oblivious of the infinite realities happening just like you and someone on the other side of this planet but across infinity of space and if space is indeed infinite then there are infinite versions of you and this galaxy.  Yes I watch rick and morty.