Neurons the size of galaxies, even if one stipulates them magically coming into existence as early as possible, couldn't have hardly thought "hello" to themselv

Neurons the size of galaxies, even if one stipulates them magically coming into existence as early as possible, couldn't have hardly thought "hello" to themselves since the universe began. In the meantime, on that time scale, incredible violence has occurred througout the universe. Round trip times of millions of years for the simplest communications are not feasible in this era of spacetime. You'll need to be waiting many tens or hundreds more billions of years before that is conceivable, in the long quiet dark before heat death. The snowflake hypothesis is at least in the range of the "things we can't disprove", at least if by "snowflake" you mean neutron star surfaces: https://en.wikipedia.org/wiki/Dragon%27s_Egg https://en.wikipedia.org/wiki/Dragon%27s_Egg Of course, one must consider that I'm citing a science fiction book, with all understanding of what that means. But that is at least one hypothesis I don't think we can disprove at the current time, unlike most other ideas put forth. I'd still call it an absolute long shot, and an even longer shot that such beings could leave their star.