Something to think about as far as types of civilizations. A type 1 civilization has colonised it's entire planet and moons, a type 2 one has colonised it's entire system even if multiple suns and a type 3 has colonised it's entire galaxy and dwarf galaxies. I wasn't going to put this but here is an expanded recursive description of what type 4 civlizations and beyond be like.



If a civilization becomes so advanced that they start creating dimentionally recessed technology meaning objects or buildings that are bigger on the inside and if they start thoroughly colonising throught their entire domain then it is inevitable that they will start puttong objects inside this dimentionally recessed layer of space of a large portion or all of their colonies are connected. Eventually they will start putting entire planets and systems inside this inner layer of space or collective subspace inside the colonies. Eventually they become so advanced that the space inside their colonies becomes larger than all the lightyears of space that these coloniese straddle. Because they are dimentionally recessed the space inside keeps growing up to a point even though in normal space outside their colonies has not gotten that much larger. Because of all this entire galaxies eventually get placed inside this space so in an average colonised galaxy in normal space there are maybe hundreds of galaxies inside thissecond layer of inner space inside the colonies. This is what a type 4 civilization could be.



I'm not sure of this but it is possible that each new type of civilization is based on soemthing tens of billions of time larger in scales than the last level. Because the normal galaxies in normal space have been so colonised and because galaxies have been placed inside these colonies; even though it doesn't look it from the outside, it there by stands to reason that they would start to thoroughly colonise these inner galaxies and make a third layer of space or a second layer of dimentionally recessed space and place many more galaxies inside these that the galaxies on the outside. Then making a third layer of dimentionally recessed space from the colonisation of the third layer of galaxies these have galaxies inside them that are colonised and so on for tens of billions of layers one inside the other. This is what a type 5 civlization might be.



Take the patturn of recursion of a type 4 and 5 civilizations and expand this to tens of billions of levels and this is what a type 6 civilization might be.



Imagine the 10th type of civilization, type 100 or type tens of billions. Because this is based again on multiples of ten billion then this could be a second layer of civilizations wich could be expanded to another layer of civlvizations and so on.



There could interestingly be tens of billions of civilization layers making an unthinkable number of advancment of civilization.



This was just a thought experiment in recursion but this is possible what types of civilizations could be beyond 3 so anyway thanks.