National Geographic : 1939 Jul
SOLAR SYSTEM'S ETERNAL SHOW ( National Geographic Society Painting by Charles Ilittinger, N. A. A BLUE GLOBE HANGING IN SPACE-THE EARTH AS SEEN FROM THE MOON Our planet is this color because it is enveloped by the same "blue sky "-really air-which we see from beneath. The atmosphere scatters blue light rays more than others. Continents would be faintly visible if the day on Earth were cloudless, as depicted here. The white patches are the polar ice caps. In the fore ground is the Moon's surface, with its craters and mountains. From the Moon the sky appears black because there is no atmosphere to scatter sunlight and modify its actual appearance.