This picture of Venus was taken by the Galileo spacecrafts Solid State Imaging
     System on February 14, 1990, at a range of almost 1.7 million miles from the planet. A
     high pass spatial filter has been applied in order to emphasize the smaller scale cloud
     features, and the rendition has been colorized to a bluish hue in order to emphasize the
     subtle contrasts in the cloud markings and to indicate that it was taken through a violet
     filter. The sulfuric acid clouds indicate considerable convective activity, in the
     equatorial regions of the planet to the left and downwind of the subsolar point
     (afternoon on Venus). They are analogous to 'fair weather clouds' on Earth. The
     filamentary dark features visible in the colorized image are here revealed to be
     composed of several dark nodules, like beads on a string, each about 60 miles across.
     The Galileo Project is managed for NASA's Office of Space Science and
     Applications by the Jet Propulsion Laboratory; its mission is to study Jupiter and its
     satellites and magnetosphere after multiple gravity assist flybys at Venus and Earth.
     These images of the Venus clouds were taken by Galileo's Solid State Imaging
     System February 13,1990, at a range of about1 million miles. The smallest detail
     visible is about 20 miles. The two right images show Venus in violet light, the top one
     at a time six hours later than the bottom one. They show the state of the clouds near
     the top of Venus's cloud deck. A right to left motion of the cloud features is evident
     and is consistent with westward winds of about 230 mph. The two left images show
     Venus in near infrared light, at the same times as the two right images. Sunlight
     penetrates through the clouds more deeply at the near infrared wavelengths, allowing
     a view near the bottom of the cloud deck. The westward motion of the clouds is
     slower (about 150 mph) at the lower altitude. The clouds are composed of sulfuric
     acid droplets and occupy a range of altitudes from 30 to 45 miles. The images have
     been spatially filtered to bring out small scale details and de- emphasize global
     shading. The filtering has introduced artifacts (wiggly lines running north/south) that
     are faintly visible in the infrared image. The Galileo Project is managed for NASA's
     Office of Space Science and Applications by the Jet Propulsion Laboratory; its
     mission is to study Jupiter and its satellites and magnetosphere after multiple gravity
     assist flybys at Venus and Earth.