Viewers of a certain age (including my own) may remember the children's TV show Big Blue Marble—reminiscent of the photograph of our water world taken by Apollo 17 astronauts in 1972 (top).I ...

One of the most famous photos ever taken is NASA’s Blue Marble - a beautiful picture of Earth from space taken on 7 December, 1972. The brown and green of Africa makes way to the white of Antarctic ...

A new satellite photograph of Earth depicts our planet in all its aquatic splendor, revealing a truth somewhat obscured in the original Blue Marble image. That photograph is among the defining ...

This photo from NASA's Suomi NPP satellite shows the Eastern Hemisphere of Earth in "Blue Marble" view. The photo, released Feb. 2, 2012, is a companion to a NASA image showing the Western ...