Our monkey brains are waaaaaay too puny to begin to comprehend something like the vastness of the universe. I've tried, but it can't be done. The largest field of vision that I can really comprehend is the view from a mountaintop...maybe a few miles. I can't get a good mental image of how big my county is, or my state, or my country, or the planet. Over the distances I can imagine, light seems to move instantaneously. The farthest objects we can detect are 13.7 billion light years away. That's the distance light has traveled in 13.7 billion years, a stretch of time I cannot imagine for similar reasons. If my whole lifetime up until now (22 years) represented the age of the universe, my birth would have occurred a little over one second ago. There is no possible way any human could imagine that kind of vastness, so there's no point in trying. There was no evolutionary advantage in being able to wrap our minds around things larger than the environment we lived in. Some numbers are just too big for us. The ancient Egyptian hieroglyph for "million" was a man with his arms raised in astonishment (see pic).