Apollo in Perspective: Spaceflight Then and Now takes a retrospective look at the Apollo space program and the technology that was used to land a man on the Moon. Using simple illustrations and school-level mathematics, Jonathan Allday explains the basic physics and technology of spaceflight and conveys the huge technological strides that were made and the dedication of the people working on the program. Physics topics covered include the laws of motion, rocketry, how to maneuver in orbit, and more. Informal and engaging, the book also discusses the designs of the Apollo Command, Service and Lunar modules and how these changed as the plans for the manned mission evolved. Guidance systems, computers, and engines all had to be developed for the first time. With Apollo as background, the book proceeds to look at the space shuttle, the technology being developed for its replacement, the International Space Station, and the possibilities for a manned Mars mission. The book concludes with an exploration of the far future, including Mars colonies and journeys to other stars.