Could you replace your eye with a camera?

I LOVE you and the way you explain and teach. I'd love to share an oversight maybe even  oversight by top scientist throughout the world. Energy is conserved even in an expanding universe. until we discover what were expanding into, we have to assume the universe can contract. thus in contraction the wave shift would regain the same exact energy that propagated in the expansion. Just food for thought, i sure hope you read this :)