Advanced civilizations will likely migrate into rich clusters of galaxies, which host the largest reservoirs of matter bound by gravity against the accelerated cosmic expansion.
The accelerated expansion of the Universe pushes resources away from us at an ever- growing speed. Once the Universe will age by a factor of ten, all stars outside our Local Group of galaxies will not be accessible to us as they will be receding away faster than light. Is there something we can do to avoid this cosmic fate?
Following the lesson from Aesop’s fable “The Ants and the Grasshopper”, it would be prudent to collect as much fuel as possible before it is too late, for the purpose of keeping us warm in the frigid cosmic winter that awaits us. In addition, it would be beneficial for us to reside in the company of as many alien civilizations as possible with whom we could share technology, for the same reason that animals feel empowered by congregating in large herds.