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The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
Noctilucent clouds are extremely rare very high clouds seen in the night sky, usually on clear, summer nights. They become visible about the same time as the brightest stars and are usually bluish or silvery.
Otherwise known as 'The King of Clouds', cumulonimbus clouds exist through the entire height of the troposphere, usually characterised by their icy, anvil-shaped top.
It's important to keep your home warm to avoid health problems.
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