#OnThisDay January 31, 1958: Orbital Turning Point.

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References / More Knowledge:
Jet Propulsion Laboratory. “Explorer 1 Overview.” NASA Jet Propulsion Laboratory. https://www.jpl.nasa.gov/missions/explorer-1

National Aeronautics and Space Administration. “Explorer 1 and the Beginning of Space Exploration.” NASA History Office. https://history.nasa.gov/explorer.html

Smithsonian National Air and Space Museum. “Explorer 1.” https://airandspace.si.edu/collection-objects/explorer-1

Van Allen, James A. “Radiation Belts Around the Earth.” Scientific American, May 1959. https://www.scientificamerican.com/article/radiation-belts-around-the-earth/

U.S. Army Center of Military History. “The U.S. Army and the Space Mission.” https://history.army.mil/html/books/070/70-103-1/index.html

#AmericanHistory #SpaceRace #Explorer1