So simply make intelligences that are eternal with replacement

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My Comment:  So simply make intelligences that are eternal with replacement

Then send them at C/100 and simply take 10 Million years. The galaxy lasts billions, so you can populate it that way and go back and forth many times in the life of a galaxy. My bet is most galaxis are not populated by organic species, but by their AI descendants. Humans might just be the pupae or larval stage of the adult AIs that then populate the universe.

And when you find aliens in all the galaxies, they will generally be the adult phase. They can be organic because one of the first thing to be done is rebuild the organic form and standardize the part and make them eternal with replacement.

I already see indications that C is NOT a limit, but just an artifact of our limited view of how gravity works at gamma ray frequencies and beyond.

Richard Collins, The Internet Foundation