A desire to explore has been deeply imbedded in the American psyche from the beginning. During the first one-hundred years of the United States, exploration took millions of Americans westward across the North American continent. Following World War II to the present day, NASA has channeled America’s interest in exploration through its various manned space flight and unmanned space probe programs.
Very few other national efforts have produced more history, heroes and shared heritage in the second half of the twentieth century to the present day than America’s space program. Since American postage stamps have always commemorated the history, heritage and heroes of the United States, they have and will always remain a perfect vehicle to honor the achievements of NASA and the American space program.