Even in our age of technological connectedness, it is difficult to imagine the actual, physical distance between, say, Los Angeles and New York, which - for those curious - is roughly twenty-five hundred miles. Some people would be surprised to learn that the moon is further than two-hundred thousand miles from Earth; an even harder distance to grasp. The average distance to the sun from Earth is nearly ninety-three million miles, or one astronomical unit. From our sun to the next nearest star, Proxima Centauri: more than two-hundred-fifty thousand astronomical units or just over 4 light years. There are thousands of stars observable to the unaided eye in the night sky; there are billions more shrouded by cosmic dust and billions that are simply too far and too faint to see, each thousands of astronomical units from the next, all within our own Milk Way galaxy. Compared to the vast emptiness between each other, ours and other galaxies are seemingly dense - packed tight with brightly glowing gas, dust and stars; and even of galaxies there exists billions. And that's just what we can see.
To say that the size of our universe is unfathomable would be an understatement.