For more than 40 years the Historic Documents series has made primary source research easy by presenting full primary documents and excerpts from documents on the important events of each year for the United States and the world. Each volume includes approximately 70 events with well over 100 documents from the previous year, from official or other influential reports and surveys, to speeches from leaders and opinion makers, to court cases, legislation, testimony, and much more.

Historic Documents is renowned for the well-written and informative background, history, and context it provides for each document. Each volume begins with an insightful essay that sets the year's events in context, and each document or group of documents is preceded by a comprehensive introduction that provides background information on the event. Full-source citations are provided. Readers have easy access to material through a detailed, thematic table of contents and a cumulative five-year index that directs them to related material in earlier volumes.

NASA's Voyager 1 Reaches Interstellar Space: September 12, 2013

NASA's Voyager 1 Reaches Interstellar Space: September 12, 2013

NASA's voyager 1 reaches interstellar space: September 12, 2013

On September 12, 2013, the National Aeronautics and Space Administration (NASA) announced that its unmanned Voyager 1 spacecraft had officially entered interstellar space. Voyager 1 reached a location that was more than 12 billion miles from the sun—approximately 130 times farther than Earth—and was the first human-made object to travel this far. What began in the 1970s as a historic mission to study Jupiter and Saturn now presents NASA with a unique opportunity to map the previously uncharted outer boundaries of our solar system.

The Voyage Begins

The Voyager program evolved from a 1960s proposal for NASA to embark on a “Grand Tour” of the solar system that would explore ...

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