The known is finite, the unknown infinite; intellectually we stand on an islet in the midst of an illimitable ocean of inexplicability. Our business in every generation is to reclaim a little more land. – T. H. Huxley, 1887 (P.9)

Explorations required skepticism and imagination both. Imagination will often carry us to worlds that never were. But without it, we go nowhere. Skepticism enables us to distinguish fancy from fact, to test our speculations. (P.9)

The nature of life on Earth and the search for life elsewhere are two sides of the same question – the search for who we are. (P.17)

We humans look rather different than a tree. Without a doubt we perceive the world differently than a tree does. But down deep, at the molecular heart of life, the trees and we are essentially identical. (P.26)

Mostly, the sky does not change. The same star pictures are there year after year. The Moon grows from nothing to a thin sliver to a round ball, and then back again to nothing. (P.100)

The stars are very far away. When we climb a hill or a tree they are no closer. (P.100)

I wish I knew which was true. I don’t like not knowing. (P.101)

The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff. (P.133)

Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another. (P.193)

Cosmos – Carl Sagan

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