"This second edition of Deep-Space Probes draws on the latest research to explain why we should explore beyond the edge of the Solar System. Fully updated and revised, the book describes the highly sophisticated robot spacecraft needed to carry out the first explorations in deep space, and the technical problems that are still to be solved. It also looks at the possibility of human travel into interstellar space, and some of the immense problems that such journeys would entail."--BOOK JACKET.