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Blue! but not always.

Dust particles in the atmosphere scatter sunlight and was explained by Tyndall in the 18th century? As the sun gets lower in the sky or there is a large amount of dust for example during grain harvest the particle size increases and the sky turns red. Interesting fact

The first images of the sky of Mars transmitted to Earth by the Viking probe were wrongly rendered by NASA as blue.They quickly realised their mistake and changed tto a pink colour due to dust storms in the thin atmosphere.

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16y ago

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