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Whole Earth from space, viewed from Apollo 17, December 1972. This was the first photograph of the south polar ice cap. Most of Africa is visible, together with the Arabian Peninsular and Madagascar. Credit: ARPL/NASA. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)

Whole Earth from space, viewed from Apollo 17, December 1972. This was the first photograph of the south polar ice cap. Most of Africa is visible, together with the Arabian Peninsular and Madagascar. Credit: ARPL/NASA. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)