“ There are some hundred billion galaxies, each with, on the average, a hundred billion stars. In all the galaxies, there are perhaps as many planets as stars, ten billion trillion. In the face of such overpowering numbers, what is the likelihood that only one ordinary star, the Sun, is accompanied by an inhabited planet? Why should we, tucked away in some forgotten corner of the Cosmos, be so fortunate?
— Carl Sagan, Cosmos (via whyallcaps)