Forty years ago, Buzz Aldrin became the second human, minutes after Neil Armstrong, to set foot on a celestial body other than the Earth. The event remains one of mankind's greatest achievements and was witnessed by the largest worldwide television audience in history. In the years since, millions more have had their Earth-centric perspective unalterably changed by the iconic photograph of Aldrin standing on the surface of the moon, the blackness of space behind him and his fellow explorer and the Eagle reflected in his visor. Describing the alien world he was walking upon, he uttered the...