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These are four images of the south pole of Venus in infrared light, invisible to our eyes. An eye-shaped structure in the clouds at about 60 km (37 mi) altitude evolves over a timespan of 48 hours. The upper left image is first, upper right 4 hours later, lower left 24 hours later and lower right 48 hours later. These images were taken by the Venus Express mission.

CREDIT: ESA/VIRTIS/INAF-IASF/Obs. de Paris-LESIA/Univ. of Oxford (with special thanks to G. Piccioni for the preparation of these images for this film).

Source:
http://spaceinimages.esa.int/Images/2008/03/Venus_s_polar_vortex
http://spaceinimages.esa.int/Images/2008/03/Four_hours_later
http://spaceinimages.esa.int/Images/2008/03/24_hours_after_the_first_image
http://spaceinimages.esa.int/Images/2008/03/Another_day_later