It is a 40 second exposure. The image on the right is a negative of the same image on the left. I had the CCD set to -50 Degrees Celsius, and the image is not processed. We had high clouds and light winds the night we took this image along with others images, yet almost all of them turned out pretty good. Please refer to the OAS web site to see these images as they should be viewed.
Editor regrets the inconvenience.