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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.
Weather fronts mark the boundary or transition zone between two air masses and have an important impact upon the weather.
Cycling in winter weather has some special challenges but that doesn't mean you need to put the bike away. British Cycling has some advice to help you cycle safely during the winter period.
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