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In the history of space exploration, there have been many leaps for humankind. From the foremost experts at the Smithsonian's National Air and Space Museum, here is a complete visual narrative of our journey from Earth to the stars. . . .Although the momentous October 4, 1957, launch of Sputnik 1 was not the beginning of humanity's adventure toward space - our curiosity about the skies has been one of the few constants in history - it was the first true venture into orbit. And when future generations think of the twentieth century, they will undoubtedly judge our movement into space, with both machines and people, as a crowning achievement. As we progress in the new millennium, space exploration is vital to managing our global future, as well as to understanding our past and the creation of Earth.