Sometimes the sun from the Earth looks blue Bashny.Net

And then we see him about this, no matter how it looked from Mars, because the sun is blue in cases when the Earth accidentally recreated conditions similar to Mars.

Usually we see the sun yellow, as "natural" white sun is scattered by passing through the earth's atmosphere, and changing. On Earth, a great atmosphere and a little dust. On Mars, on the contrary - the atmosphere there is little, but very dusty. Light passing through the suspended particles of dust becomes blue and the sun with Mars appears blue.

Sometimes in the world, in places of severe fires or volcanic eruptions, when the air rises a large amount of dust particles and soot, the same effect - we can see the blue sun.

via factroom.ru