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The Blue Marble
''The Blue Marble'' is a famous photograph of the Earth, taken on December 7, 1972, by the crew of the ''Apollo 17'' spacecraft, at a distance of about . It is one of the most iconic, and among the most widely distributed images in human history.〔
The image with the official NASA designation AS17-148-22727 reproduces the view of the Earth as seen by the Apollo crew traveling toward the Moon. The translunar coast photograph extends from the Mediterranean Sea to Antarctica. This was the first time the Apollo trajectory made it possible to photograph the south polar ice cap with the Southern Hemisphere heavily covered in clouds. Almost the entire coastline of Africa is clearly visible and the Arabian Peninsula can be seen at the northeastern edge of Africa. The large island off the coast of Africa is Madagascar. The Asian mainland is on the horizon toward the northeast.
The name has also been applied by NASA to a 2012 series of image data sets covering the entire globe at relatively high resolution, created by carefully sifting through satellite-captured sequences taken over time, to eliminate as much cloud cover as possible from the collated set of images.
== The photograph ==
The snapshot—taken by astronauts on December 7, 1972, at 5:39 a.m. EST (10:39 UTC)—is one of the most widely distributed photographic images in existence.〔 The image is one of the few to show an almost fully illuminated Earth disk (slightly gibbous), as the astronauts had the Sun behind them when they took the image. To the astronauts, Earth had the appearance and size of a glass marble, hence the name.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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