A Universe containing Dark Matter is often thought of as a chunk of Swiss Cheese. The holes in the galaxy representing possible black holes that have carved holes in Dark Matter are very similar to bacteria,more specifically P. shermani. P Shermani releases carbon dioxide when it consumes the lactic acid and forms bubbles. The bubbles don't just disappear, they form little air pockets, resulting in the holes of the Swiss cheese.
Basically the same process holds true for how each galaxy was formed, therefore each galaxy much the same as the holes in the chunk of Swiss Cheese would in fact have Goldilocks zones where carbon based lifeforms evolved in. I have been unable to locate any data on the number of P. Shermani in each hole of Swiss Cheese. Relatively speaking though, the number of P Shermani in a hole of a chunk of Swiss Cheese would be relative to the number of Goldilocks Zones in each galaxy.
In a late stage of cheese production, the Propionibacter consumes the lactic acid excreted by the other bacteria, and releases carbon dioxide gas, which slowly forms the bubbles that develop the eyes.
In the late stages of a solar systems development, a planet and bacteria on that planet would consume elements necessary to grow and evolve from. As such there would be a connection between solar systems, such as ours, where early life, carved a bubble of life on the planet and then moved onto other habitable words.
