Barbara Bogaev interviews astronomer and writer Donald Goldsmith about the future of space travel. He was the consultant to the PBS documentary film "Voyage to the Milky Way" (TV/Books) and is the author of the companion book.
Climate change has put organisms on the move. In her new book, The Next Great Migration, Science writer Sonia Shah writes about migration — and the ways in which outmoded notions of "belonging" have been used throughout history to curb what she sees as a biological imperative.
In his new book, Mercury Rising, Jeff Shesol writes about Friendship 7, the United States' first mission to put an astronaut in orbit around the Earth and, more broadly, about how Cold War fears fueled the early days of the space program.