Back on May 25, 1961, President John F. Kennedy announced before the world that America would put a man on the moon by the decade's end. By the middle of 1969, the Americans had completed their mission. Since then, America, and a series of other countries, have pushed space exploration's bar farther and farther, helping expand our understanding of the universe. There have been many triumphs—and tragedies—along the way. Here are 15 of the most important moments in space exploration history. As you read them, remember these words:

Not only do we live among the stars, the stars live within us.” 
― Neil deGrasse Tyson