Astronomy is full of big numbers, that are way beyond what our brains are designed to imagine. This video, dedicated to Carl Sagan, uses the Hubble Deep Field image, to show why it's so hard to get the universe into perspective.

Dr. Sagan was indeed a great man. His popularization of astronomy, and his ability to explain difficult concepts in a way that a layman can understand was a true gift. And you are right about the vastness of the cosmos is awe-inspiring. I feel wonder struck every time I look through the eyepiece of my telescope.

Superb!

Up there in the immensity of the Cosmos, an inescapable perception awaits us.
Carl Sagan

Imagination will often carry us to worlds that never were.
But without it we go nowhere.
Carl Sagan