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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.
Altocumulus clouds are generally associated with settled weather and will normally appear white or grey with shading.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
Church leader Carl Whitewood of the Salvation Army church in Ramsgate, Kent, shares how he prepares and runs a night shelter to help stop avoidable deaths of rough sleepers in winter.
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