Although the light from the sun looks white, it is actually a combination of many colors, including blue light.

虽然太阳光看起来是白色的，但实际上它是多种颜色的光线的组合，其中就包含有蓝光。

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They think maybe it was a meteor. Some people saw a column of blue light, nearly as bright as the sun, moving north to east.

据说可能是流星造成的，有人声称看到一柱蓝光，几乎像太阳一般明亮，从北向东移动。

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The Pierce the clouds the sun like root gold, arranged in a crisscross pattern, the light gray, blue and gray clouds sewn into a very beautiful pattern.

那刺穿云块的阳光就像根根金线，纵横交错，把浅灰、蓝灰的云朵缝缀成一幅美丽无比的图案。

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But a clear, cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more easily than they do red light.

BBC: rainbow

At sunset, the sun appears red (the blue light has been scattered out of that image, too), so the cells of the eye that detect red are overloaded and incapable of registering weaker red signals.

ECONOMIST: In a flash

And the sky is blue, it says, because the sun produces white light which is made up of all the colours of the rainbow.

BBC: rainbow