The sunlit edge of Titan’s south polar vortex stands out distinctly against the darkness of the moon’s unilluminated hazy atmosphere. The Cassini spacecraft’s images of the vortex led scientists to conclude that its clouds form at a much higher altitude — where sunlight can still reach — than the surrounding haze.
Titan, about 5,150 kilometers across, is Saturn’s largest moon. Cassini was about 1.3 million kilometers from Titan when it caught this image.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. For more information about the Cassini-Huygens mission, visit https://www.nasa.gov/cassini and https://saturn.jpl.nasa.gov.