Voyager's Grand Tour: To the Outer Planets and Beyond (Smithsonian History of Aviation and Spaceflight Series)

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Summary: A Stunning History of a Stunning Space Science Mission
Review: "Voyager's Grand Tour: To the Outer Planets and Beyond," is an excellent book that tells the fascinating story of an overwhelmingly significant pair of probes that went to the outer planets of the Solar System, one of which is still providing scientific data as it reaches our heliopause.

The Voyager project was one of the most important in the history of NASA and the first to visit the outer planets of Jupiter, Saturn, Uranus, and Neptune. It originated during the early 1960s when astronomers realized that once every 176 years both the Earth and all the giant planets of the Solar System gather on one side of the Sun. This geometric line-up made possible close up observation of all the planets in the outer solar system (with the exception of Pluto) in a single flight, the "Grand Tour." The flyby of each planet would bend the spacecraft's flight path and increase its velocity enough to deliver it to the next destination. This would occur through a complicated process known as "gravity assist," something like a slingshot effect, whereby the flight time to Neptune could be reduced from 30 to 12 years. NASA launched these missions from Cape Canaveral, Florida: Voyager 2 lifting off on August 20, 1977, with Voyager 1 entered space on a faster, shorter trajectory on September 5, 1977. These spacecraft would take a spectacular windshield tour of the outer Solar System gas giant planets.

The scientific results of the Voyager mission were astounding, essentially rewriting the textbooks on the Solar System. Over a period of more than a decade the probes explored all the giant outer planets, 48 of their moons, and the unique systems of rings and magnetic fields that those planets possess. The two spacecraft returned to Earth information that revolutionized the science of planetary astronomy, helping to resolve some key questions while raising intriguing new ones about the origin and evolution of the planets in this Solar System. The two Voyagers took well over 100,000 images of the outer planets, rings, and satellites, as well as millions of magnetic, chemical spectra, and radiation measurements. They discovered rings around Jupiter, volcanoes on Io, ice on Europa, shepherding satellites in Saturn's rings, new moons around Uranus and Neptune, and geysers on Triton. The last imaging sequence was Voyager 1's portrait of most of the Solar System, showing Earth and six other planets as sparks in a dark sky lit by a single bright star, the Sun.

Perhaps a personal anecdote is in order here. When Voyager reached Jupiter in 1979 I was a starving graduate student working on a Ph.D. in the history of the American West. Like everyone, I saw the images that came back to Earth and was truly impressed. When I filed my income tax form the next year I included a little note, which I'm sure made the clerk at the IRS chuckle, that stated that I wanted all of my tax money paid that year to go to NASA because of what it had accomplished with Voyager. Perhaps it was silly gesture but it points up the impressive nature of the scientific return.

This book makes clear that Voyager was an early step in humanity's exploratory journey extending not only to the outer planets but also beyond the Solar System. It is a scintillating portrait of a critical program and a must read for all interested in the history of space exploration.

Highly recommended!

Rating:
Summary: An Outstanding Voyage of Discovery
Review: This book is a scientific history of the Voyager 1 and 2 missions, with in-depth coverage of the technological development of the spacecraft, the scientists and engineers involved, and budgetary and political concerns. This history stretches back for decades, culminating in the launch of the two vessels in 1977 and their exploration of the outer planets, and their current wanderings at the edges of interstellar space. Note that actual planetary science covering our new knowledge of Jupiter, Saturn, Uranus, Neptune, and their many moons is found in other books, even though that knowledge was provided by the Voyager vessels. Here the authors betray their weaknesses in planetary astronomy with very rushed coverage of those matters, which only appear in the final third of the book anyway. Meanwhile some of the technical and budgetary coverage gets quite tedious, although such scientific history is meant to be the focus of the book. But as a whole this volume does give a very in-depth history of mankind's most far-reaching scientific achievement, as we have realized the dream of extending human knowledge through and beyond our solar system. [~doomsdayer520~]

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Summary: Superb history of Voyager
Review: This is a superb history of the voyager project. Well written with plenty of illustrations. It's a must for anyone interested in the accomplishments of remote exploration of the outer planets. One note however. A previous reviewer faulted the authors for not being knowledgeable about planetary astronomy. Ronald Schorn, the co-author, was once head of planetary astronomy for NASA. He's treated this subject exhaustively in his previous book, "Planetary Astronomy: From Ancient Times to the Third Millenium." Obviously the author didn't wish to rehash what he had already published.