Star Trails

kuahji

National Geographic is featuring this star trail picture this week on their wallpaper page (found here http://ngm.nationalgeographic.com/yo...k-4-1_1600.jpg). In the picture though I was wondering why the star trails appear so much more dense on the right side of the picture than the left. Any ideas?

Drakkith

That section of the sky simply has more bright stars than the other.

NeuronsAtWork

I'm sure Drakkith is correct--also the actual trails seem a bit overexposed, and that exacerbates the effect. I would guess that the photographer possibly 'stacked' multiple images and the alignment might have been off a bit, because the single exposure shots I've seen tend to be sharper. Anyway, see the shot on the homepage here--
http://startrails.de/
It resembles the one you referenced, as far as the imbalance you noted...