See related story: Titan Photos Pose New Questions
This graph shows that the ratio of "heavy" nitrogen to "light" nitrogen in Titan's atmosphere is much higher than in the atmospheres of other celestial bodies in our solar system. Scientists believe this means that something has caused the light nitrogen in Titan's atmosphere to disappear over a long period.
Courtesy of NASA/JPL/University of Michigan
The dark semicircle in the left fifth of this radar image may be a crater on Titan's surface. But the general lack of distinct craters in photos of Titan have scientists wondering whether the moon is still quite young, or whether the craters caused by impacts with asteroids and comets are quickly filled over with liquid or dust.
Courtesy of NASA/JPL
When scientists first saw this patch of bright white clouds at Titan's southern pole, they thought it was formed by methane. But further measurements taken by the Cassini spacecraft show that the clouds do not have the same chemical "signature" as methane clouds.
Courtesy of NASA/JPL/Space Science Institute
Scientists believe the streaks on Titan's surface, which run from left to right in this photo taken by the Cassini spacecraft on Oct. 26, may be caused by wind blowing dust around large obstacles.
Courtesy of NASA/JPL/Space Science Institute
