Doesn't part of the awe that fills us when we confront the unknown come from understanding that, should it at last flood into us and become known, we would be altered? In our view of the stars, we find a measure of our own incompleteness, our still-yet unfinishedness, which is to say, our potential for change, even transformation. That our species is distinguished from others by our hunger and capacity for change has everything to do with our ability to recognize the limits of our understanding, and to contemplate the unfathomable.