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	* These files require the Adobe Acrobat Reader to view PDF files. Download the plug-in here. Explorer 1 White Sands Proving Ground Take a step back in time and follow the historic story of how the United States responded to Sputnik, the world's first Earth-orbiting satellite launched by the Soviets in 1957. JPL designed and built -- and, in cooperation with the Army, launched -- Explorer 1, the first U.S. satellite and the first spacecraft ever to return scientific data from space. + PDF (9.7Mb) + Text version History of JPL http://www.jpl.nasa.gov/jplhistory/ This site begins with JPL's early years in the 1930s and recounts the major historical moments for the Lab. JPL 101 (PDF) http://www.jpl.nasa.gov/about_JPL/jpl101.pdf This online book provides an in-depth overview of JPL's history. 40 Years of Exploration http://www.jpl.nasa.gov/history/index.html A timeline that covers forty years of space exploration, beginning with the first spacecraft to fly past another planet. (1962 - 2002)
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