These images show changes in the cloud structure seen on the Venus night side over 3 nights in December 2005.
The images are taken at a wavelength of 2.3 microns and show the clouds in silhouette against the hot lower atmosphere,
with the overexposed sunlit crescent on the left of each image. The cloud structure changes almost completely
from one night to the next due to the rapid "superrotation" of the upper atmosphere.