"Galileo thought that comets were an optical illusion. This is fertile ground: since we are certain that they're not, we can look at what scientists are saying with fresh hope. What if there are really gleaming castellated cities hung upside-down over the desert sand? What limpid lakes and cool date palms have our caravans passed untried? Until, one by one, by the blindest of leaps, we light on the road to these places, we must stumble in darkness and hunger."
- Annie Dillard