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Why is the Earth referred to as the 'blue marble'?

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When you look at Earth from outer space, it resembles a blue marble.
The term was first used after a photograph of the'Earth, taken by the crew of Apollo 17 in December 1972, was published.
In it, the Earth appears like a blue marble with swirls of green, brown, yellow, and white. The blue colour comes from the water covering most of the Earth's surface. The yellow, brown, and green are the land masses. The white comes from the clouds in the atmosphere.
The original photograph was taken by the spacecraft as it was en route to the Moon at a distance of about 29,000 kilometres. It shows Africa, Antarctica, and the Arabian Peninsula.
This photo is special, very because it is the first full photo of the Earth ever taken.
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