The "Blue Marble" was the first photo of the whole Earth and the only ever taken by a human. Fifty years on, new images of ...

Widely acknowledged as one of the most widely distributed photographic images in existence, the "Blue Marble" was ...

The "Blue Marble" was the first photograph of the whole Earth and the only one ever taken by a human. Fifty years on, new images of the planet reveal visible changes to the Earth's surface.