NASA's Blue Marble: 50 Years Of Earth Images
March 12, 2012 10:00 AM NASA's Earth-observing satellites help scientists render photo-like composite images with unprecedented detail. Take a look, from the earliest attempts to the newest stunners.
The Original Blue Marble
Pictured here is the Earth as seen from Apollo 17 as it traveled toward the Moon in December 1972. The area in the photograph extends from the Mediterranean Sea to the Antarctica polar ice cap. You can see the coastline of Africa and, on the horizon to the northeast, the Asian mainland. Credit: NASA