Thursday, September 29, 2011

Painted clouds

I am not sure why I am so attracted to clouds, but I do find them often fascinating. This particular sample has an almost almost oil painted look, typical of the autumn season that is now upon us.

Wednesday, September 28, 2011


Apparently the homeowner is not concerned with the vegetation that is taking over this house. I sometimes wonder how quickly all things man made would be obscured by nature if not kept in check.

Monday, September 19, 2011

Why is the sky blue?

We know the lake is blue not because it is water, but because it is reflecting the sky.

But why is the sky blue.

It turns out that light scatters as it travels though the atmosphere, and the blue component of sunlight has a shorter wavelength. Because the shorter wavelength has more energy then red or yellow, it scatters more and is hence more visible in the sky.

Of course the sky is not blue all of the time. For example at senset it turns to red and yellow. This is because the light is traveling though a lot more atmosphere and this means most of the blue has by then scattered away.

It is hard to image, but that if physics worked differently, instead of blue skys we could have red skys during the day.

Sunday, September 18, 2011