"Ground control to Major Tom." The ominous opening line of David Bowie's signature song has become iconic in itself. But the song's trippy, otherworldly melodies, punctuated by lyrics that belie an existential sadness, perfectly capture the fascination with space exploration that defined the '60s. And it's still making history today: In 2013, Canadian astronaut Chris Hadfield filmed himself performing the song from the International Space Station, thus creating the first music video shot in space.
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