For the first time in history, our species has the technology to destroy itself, but we are also able to leave Earth and voyage into the vastness of space. After millions of years of evolution, we've arrived at the point where we can settle other worlds and begin the process of becoming multi-planetary. How did we get here? What does the future hold for us? A Mission Manager at SpaceX, Andrew Rader examines the period in which the Phoenicians, Persians, and Greeks ventured forth; the age of European exploration; the era of scientific inquiry, when researchers developed brand new tools for mapping and traveling farther; and our spacefaring future, with plans underway for settling other planets.