(2017-08-20, 11:33 AM)Hjortron Wrote: Just like I don't consider my life more meaningful and relevant upon the realization that I am a larger physical structure than individual quarks, I don't think that my life is less meaningful and relevant upon the realization that galaxy clusters are larger physical structures than I am.
Exactly this. It's all relative - people who make this argument choose to compare themselves to bigger things, but that's completely arbitrary: it's also possible to compare oneself to smaller things, and even to nothingness. Compared to nothingness, our lives are incredibly meaningful!
But anyway, as you ask, what does physical size have to do with the meaningfulness of a life? If we shrunk ourselves down to 50% of our current size, would our lives then be 50% less meaningful? If not, what's the formula relating physical size to meaning? (Rhetorical question).
The truly relevant entity when it comes to meaning in life is non-physical and probably has no size: our consciousness and ability to experience.