The Blue Marble

This is one of the most recognizable photos of Earth. Taken by the Apollo 17 crew on December 7, 1972, it shows our home planet in all its majestic glory. The NASA astronauts were heading home at the time, snapping the photo at a distance of 18,000 miles (29,000 kilometers). Africa and Madagascar can be seen in the frame, along with the Arabian Peninsula and Antarctica.