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Review: Interplanetary Robots

Interplanetary Robots: True Stories of Space Exploration
by Rod Pyle
Prometheus Books, 2019
paperback, 368 pp., illus.
ISBN 978-1-63388-502-8

The story of the robotic exploration of the solar system is one that has been told over and over, even as that story changes with new missions to new destinations. Some books focus on specific missions, while others devote their attention to places like the Moon and Mars that have been visited by many such missions. A comprehensive overview of six decades of planetary exploration, in a single volume, could only explore the history of that exploration at a high level.

The new book Interplanetary Robots by veteran space writer Rod Pyle does attempt to provide a broad overview of the history of robotic missions through the solar system. The book is not a comprehensive history of such missions but, as its subtitle suggests, one that focuses on some of the more interesting anecdotes and aspects of that history.

The more than three dozen chapters in the book are organized by destination, starting with the Moon and Mars and then moving on to Venus and the outer solar system, although Mars makes an appearance again later in the book. Interspersed throughout the book are Pyle’s experiences being at JPL for the Curiosity Mars landing in 2012, as well as being there for the end of the Cassini mission in 2017. (He also recalls, as a college student, sneaking into an event on the Caltech campus for the Viking 1 landing in 1976.)

The book does have an emphasis on missions run by JPL. Some of the book’s latter chapters go into great detail about the Galileo mission to Jupiter and Cassini mission to Saturn, both major planetary science missions run by JPL. Yet, the New Horizons mission that flew by Pluto (and, less than a month ago, the Kuiper Belt object 2014 MU69, aka Ultima Thule) is mentioned only very briefly at the beginning of the book, and there’s no mention at all of MESSENGER, the first mission to orbit Mercury. Both MESSENGER and New Horizons were run by the Applied Physics Lab in Maryland, across the country from JPL.

The doesn’t mean that the book is devoted exclusively to JPL missions: there’s some discussion of Soviet missions to the Moon, Mars and Venus in the book. That includes an examination of a concept of a Mars sample return mission studied by Soviet engineers in the 1970s, Mars 5M, that would have involved two launches of Proton rockets, one to carry a transfer stage and the other a combination orbiter/lander. It would have been a remarkably complex mission to carry out—and one likely doomed to failure given the Soviet track record for less ambitious Mars missions, had it not been cancelled in 1978. Mars sample return remains a long-term, and difficult, goal for solar system exploration.

Even though Interplanetary Robots is not a complete history of solar system exploration, it’s still an interesting book that offers a broad overview of missions, and proposed missions, throughout the solar system. Even those familiar with its history will likely learn some things about those concepts, particularly those that failed to get off the drawing boards like Mars 5M. It also illustrates how even robotic missions are truly human pursuits.


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