Could we build space craft that could travel to distant stars? Could we augment human biology for spaceflight? Could the search for extraterrestrials be brought into the mainstream of scientific research? Avi Loeb tells us that in each case, the real question is not could we, but will we choose to? An urgent explanation of why becoming an interstellar species is imperative for humanity's survival. From the bestselling author of "Extraterrestial".