Neil deGrasse Tyson is a rare breed of astrophysicist, one who can speak as easily and brilliantly with popular audiences as with professional scientists. Now that NASA has put human space flight effectively on hold--with a five- or possibly ten-year delay until the next launch of astronauts from U.S. soil--Tyson's views on the future of space travel and America's role in that future are especially timely and urgent. This book represents the best...