“That's what this book is about: other worlds, what awaits us on them, what they tell us about ourselves, and - given the urgent problems our species now faces - whether it makes sense to go. Should we solve those… — Carl Sagan Copy Share Image
There are two problems for our species' survival - nuclear war and environmental catastrophe - and we're hurtling towards them. Knowingly. — Noam Chomsky Copy Share Image
