The Titanian Volcano (2)

Caption NASA originale:"Details of the circular feature, that scientists think is an ice volcano, which could be a source of methane in Titan's atmosphere, show up at wvlgts larger than 1,3 microns (1 micron is one-millionth of a meter; 1 meter is 39"). The first 6 panels are images of the feature taken in 6 infrared windows. Images made up of two colors (ratio images) are represented in order to visualize compositional variations, which appear to be slight. The last panel is a color composite image (red, 2,75 micron; green, 2 micron; blue, 1,6 micron). These images were acquired with Cassini's VIMS. Titan, Saturn's largest moon, is the only known moon to have a significant atmosphere, composed primarily of Nitrogen, with CH4 (about 2/3%) as the largest remaining component. One goal of the Cassini mission is to find an explanation for what is replenishing and maintaining this atmosphere".