What is man that you are mindful of him?

I just saw a random computer generated clip from NASA TV called "Cosmic Collisions." It covered the different possible collisions in our universe, from asteroids that, as they supposed, killed off the dinosaurs to the collision of galaxies. Yes, galaxies. As it told of collisions, it zoomed out of our solar system. That can make you feel small enough. Then it zoomed out to show the entire Milky Way. That makes you feel that you don't have anything on an atom--comparitively speaking, you don't even register. But when you watch the Milky Way collide with galaxy Andromeda, and the gases mix over what would have to be billions of years, and they combine to form a new united galaxy, what can you do but wonder, "Wow. Could it happen? Is that how big our universe is? Would I even notice if that happened (if I could live that long, that is)?" But then I had a thought. As I listened to "Walking in the Air" by Celtic Woman, I realized that watching galaxies collide seems something God might enjoy in His pastime. And why not might we enjoy it in Heaven? It's a wonder that He even wants us to watch galaxies with Him. Why does God care so much about not-even-atoms?

And how do we miss Him?