On hearing the word sky, a blue sheet appears in front of the eyes. But have you ever wondered why the sky is blue? And when ...

Why is the sky blue in colour? The colour of the sky is ... which is why space appears black to us. At sunrise and sunset, the light has to pass through more of the Earth's atmosphere compared ...

Sunset, Banffshire (Image: Christine Webster) “Blue light doesn’t travel particularly well through the air, which is why the sky is blue," he said. "It gets scattered across the top of the ...