what do you suppose is the purpose of all those other galxies out there?

The one pupose I find is to for God to emphasize how insignificant man is in the scheme of things. Perhaps, there are inhabitable planets out there in some of them, and the design of the Universes is not to make contact between any two human-like existences possible or necessary, in that even the nearest ones are lightyears away that unless you could make a spacecraft that travels cosest to the speed of light you would not be able to even contemplate going anywhere. Contact through any other means is less than efficient if not rewarding.

The purpose of all those other galaxies is maybe to hold life like ours just for the sake of existing. There is a high chance that there might be some other life out there and the galaxies are just waiting for us to explore. Traveling to any point in space would be useful, and fun. Wonder what's at the end of the Universe. . .

Or,it could create a whole bunch of New ones for You

maybe before the earth was created the Creator had to experiement on what would work for a suitable place for humans and those are all his fails. Or maybe there is more to it and there really is life out there?

I think the purpose of all those other galaxies is to show how wonderful and grateful the creator (God) was... xD