This Dec.1972 photo released by NASA shows a view of the Earth as seen by the Apollo 17 crew traveling toward the Moon. The photograph extends from the Mediterranean Sea area, top, to the Antarctica South polar ice cap, made visible for the first time by the Apollo trajectory. Only two dozen men, those who traveled to the moon, have had the full Earth view. Most U.S. spaceflight has been in low orbit where only a piece of the Earth can be seen, a lesser but still impressive glimpse.