The astrophysicist director of the Hayden Planetarium in New York discusses the future of space travel and the importance of its exploration for the United States' economy, security, and morale.
The astronomer who inadvertently triggered the "demotion" of Pluto in his effort to officially recognize the solar system's tenth planet describes the ensuing debates and public outcry while revealing the behind-the-scenes story of his discovery.
Authors present differing opinions on whether the U.S. government should cut NASA funding, whether international cooperation benefits space exploration, and whether commercialization of space travel will benefit space exploration.