How though? Frogboy already explained that hyperdrive can't handle the gulf between galaxies, because there is no mass there. So you wouldn't be able to use it to transport the hypergate.
Ahhh. I see.
Still, I'm not quite sure if adding multiple galaxies is a good idea. The biggest map in GalCiv 2 required you to handle hundreds of planets. The biggest map in GalCiv 3 could potentially require you to handle over a thousand planets. Adding multiple galaxies would increase that even more. Then you need to add all the ships, starbases, resources, and so on. You would need a very good UI to manage all of that. More importantly though, you're going to need a lot of time to play that. A Immense map in GalCiv 2 can already take months to finish. A Gigantic (or whatever they're going to call it) map in GalCiv 3 is probably going to take even longer. Multiple galaxies of that size? A year? More? I'm all for big maps, but this is getting ridiculous. Who'd have time to finish such a game?
My suggestion to this is to split the map between the number of galaxies. So, instead of having two or more Gigantic-sized galaxies, you'd have one Gigantic map split between two or more galaxies. That'd be much more manageable, and would offer just as many strategic options. Maybe even more so. Finding a way to reach the other galaxies would be much more important, because your ability to expand would be much more limited.
I guess having that many ships, planets, resources, etc. would be a lot to handle, for your machine also. I like the idea of putting two "galaxies" in the same galaxy, but I would like more of a barrier. If you research enough life support or build enough starbases, you can get anywhere. It would be cool to suddenly have a larger part of the galaxy opened up in late game and add depth. But you're right, it would probably be too much to handle if they were separate.
In my idea, each galaxy would be an individual map. The content of each galaxy would be total content of the selected map-size divided by the amount of galaxies. So a Huge map with two galaxies would turn into two Medium-size maps, for example.
The only question is, how would you get from one galaxy to the next? Both from a lore-standpoint and from an interface-standpoint. Maybe a simple toggle to switch between the galaxies, or an intermediary map between them (a universe map, if you will). Getting your ships to another galaxy will most likely require researching a new form of engine specific for this purpose. Or you could try STL, which would take a loooong time.
This is pretty much what I would want, but how?
Will there be a map designer for GC3? If so, you could easily customize a galaxy to act like 2 galaxies, but I remember the map designer for GC2 was not very user friendly and took vast amounts of time to design even a star cluster in a galaxy.