The journey is difficult, immense. We will travel as far as we can, but we cannot in one lifetime see all that we would like to see or to learn all that we hunger to know.
Loren EiseleyOver the whole earth- this infinitely small globe that possesses all we know of sunshine and bird song- an unfamiliar blight is creeping: man- man, who has become at last a planetary disease and who would, if his technology yet permitted, pass this infection to another star.
Loren Eiseley