Our Precarious Existence

One human life span is but an instant as viewed over the awesome expanse of time. We live that instant on the cool crust of an orbiting rotating molten orb. In terms of a globe, we could not survive one paint layer depth below the suface because of intolerable heat. We could not survive one paint layer above the surface because of the thin layer of life supporting atmosphere. We live on the crust of a speck in a universe of such enormity that it exceeds our imagination.