Board Thread:Fiction Universe Discussion/@comment-47205-20160329150225/@comment-1073312-20160408232700

Apologies to add to the fray of suggestions, as it has already been voiced that we me may be diving into over-complications without full support.

Here's a suggestion: recently astronomers discovered "Super Spirals", which have 10 times the mass of the Milky Way and some approaching four hundred and half thousand light years in diameter. If we are after big and perhaps more unusual galaxy types; these are the ones to go for. Astronomers were surprised that these galaxies were not limited like ours in terms of star formation, so are more likely to be metal rich and with a wider range of star types. If the inhabited stars are on the outskirts of the galactic arms, I think supernovae and orbital disruption would be less of issue too.