Jumping in. My guess it was taken where there is a lot of haze, filtering the light down to a managable exposure. The darker color near the bottom is an indication of this. An example would be evening in Los Angeles. You expose to the sun not the sky when you take a shot like this. There is also a lot of zoom involved in this shot.
You can see by the stop and shutter speed, there was about as much light looking at the sun as a sceen might be lit on a sunny day. It was fairly dark out.
Rich
