This image shows thermal infrared radiation (at a wavelength of 5 microns) emitted by the cloud-tops at the southern polar region of Venus on 20 January 2008, as viewed by the VIRTIS imaging spectrometer on Venus Express. The white arrows show the atmospheric winds, measured by tracking the movement of cloud features.
Photo credit: ESA/VIRTIS-VenusX/INAF-IASF/LESIA-Obs. Paris/Univ. Lisbon/Univ. Evora (D. Luz, Univ. Lisbon & D. Berry, Univ. Evora)
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