Prior to the "Blue Marble," campaign images had often focused on pollution, gas masks and endangered species.A self-portrait of humanityApollo 17 marked the end of the Apollo lunar exploration ...

On Christmas Eve in 1972, humanity received a gift: A portrait of the Earth as a vivid globe.Clouds swirl over the vast African continent and south polar ice cap, all set against the deep blue of our ...

Prior to the "Blue Marble," campaign images had often focused on pollution, gas masks and endangered species.A self-portrait of humanityApollo 17 marked the end of the Apollo lunar exploration ...

Taken 50 years ago on Wednesday, the “Blue Marble” has become one of the world’s most widely reproduced photographs — and an icon of the environmental movement. CNN values your feedback 1.