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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.
A fallstreak hole (also known as a holepunch cloud) forms when part of the cloud layer forms ice crystals which are large enough to fall as a 'fallstreak'.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
Now winter is well and truly here, we need to think about how we can stay as healthy as possible throughout the season.
Please note that when changing units, only forecasts and maps will be affected.