Its beyond our brains capabilities to put it into perspective. I can't even visualise one lightyear. I mean, imagine a whole year at 186,000 miles per second. Actually I can't even visualise a light minute! LoL.
Standard response to every thread that deals with the size of the universe:
Space is big. Really big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist, but that's just peanuts to space.