Carl Sagan's Vision of the Human Race's Future

We were hunters and foragers. The frontier was everywhere. We were bounded only by the Earth and the ocean and the sky. The open road still softly calls. Our little terraqueous globe as the madhouse of those hundred thousand millions of worlds. We who cannot even put our own planetary home in order, riven with rivalries and hatreds, are we to venture out into space? By the time we're ready to settle even the nearest other planetary systems, we will have changed. The simple passage of so many...