<p><br> Earth seems to fill the sky in this image taken by the crew of Apollo 17 in 1972. The picture marked the first time astronauts were able to photograph the south polar ice cap.</p>

Earth


Earth seems to fill the sky in this image taken by the crew of Apollo 17 in 1972. The picture marked the first time astronauts were able to photograph the south polar ice cap.

Photograph courtesy NASA

Earth

See pictures of the planet Earth and its moon in this Earth photo gallery from National Geographic.

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