Galaxies like grains of sand...
It's been said that the galaxies of our universe are more numerous than all the grains of sand on our planet. Realizing that this image is but a tiny slice of the visible sky, one can't help but ponder that fact in all its enormity.
I know that there's a fininite number of grains of sand on earth. I have trouble fathoming "infinity" and when I look at the universe I can't see it not having a wall at the furthest reaches of it. Kinda like the universe being in a big box. But if there is a box then what's on the other side of the wall? Just "nothing", just empty black space where nothing exists?
Like I said, it's too hard to comprehend.....