Bizarre flashes of cosmic light may actually be generated by advanced alien civilizations, as a way to accelerate interstellar spacecraft to tremendous speeds, a new study suggests. (Source)
In Buddhist cosmology, there exist billions of world-systems, each of which contains billions of worlds. This has always sounded like a description of galaxies to me.
The hypothesis that “fast radio bursts” could be evidence of alien spacecraft is presented in the linked article, which also has a link to the study itself.