Earthrise: the story behind our planet's most famous photo

When Bill Anders took this photograph from the Apollo spacecraft on Christmas Eve in 1968, our relationship with the world changed forever

This photograph is now half a century old. It was taken by the astronaut Bill Anders on Christmas Eve 1968 as the Apollo 8 spacecraft rounded the dark side of the moon for a fourth time. When Earth came up over the horizon, Anders scrabbled for his Hasselblad camera and started clicking.

In that pre-digital age, five days passed. The astronauts returned to Earth; the film was retrieved and developed. In its new year edition, Life magazine printed the photo on a double-page spread alongside a poem by US poet laureate James Dickey: "And behold / The blue planet steeped in its dream / Of reality, its calculated vision shaking with the only love."