When we think of Earth, this iconic image of the “Blue Marble” immediately comes to mind.
We’ll call the above image “Blue Marble I”.
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 45,000 kilometers (28,000 miles). It is one of the most iconic, and among the most widely distributed images in human history….
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.
The photograph was taken about 5 hours and 6 minutes after launch of the Apollo 17 mission, and about 1 hour 54 minutes after the spacecraft left its…
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