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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The two unmanned space missions, the probes Voyager 1 and Voyager 2 were launched in 1977 to take advantage of a favorable alignment of the planets during the late 1970s. Although they were designated officially to study just the planetary systems of Jupiter and Saturn, the space probes were able to continue their mission into the outer solar system, and they are expected to push through the heliosheath in deep space, the first ever man made objects to do so. Learn more about one of the most ambitious missions in the history of space exploration, its goals and amazing achievements as well as the ingenious machines that carried them in this book.