Late 1945, after World War II, the Cold War began. The Cold War was when the Soviet Union and the United States of America raced to produce more nuclear weapons and a race in space exploration. On October 4, 1957, the Soviet Union launched their first satellite called "Sputnik 1." The public o the United States thought that this had something to do with "Pearl Harbor." On January 31 1958, the U.S. was quick to follow and sent their first satellite into space called "Explorer 1." Explorer 1 documented existing radiation zones surrounding Earth that are caused by the Earth's Magnetic fields that is called "Van Allen Radiation Belt."
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