The audio comes from President John F. Kennedy's early 1960s speeches on America's ambition to land a man on the Moon, a goal he set out before Congress in 1961 and restated at Rice University in 1962. Those addresses became defining moments of the Space Race and have since been replayed in documentaries, classrooms and online edits. The short opening phrase works on its own because Kennedy's voice is instantly recognisable, and the line still captures a sense of national purpose, optimism and determination that creators borrow for modern stories about exploration and achievement.