Bright, wispy markings stretch across a region of darker terrain on Rhea. In this extreme false color view, the roughly north-south trending fractures occur within strips of material (which appear greenish here) that are a different color from the surrounding cratered landscape.
To create the false-color view, ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional color differences. Most of the large-scale variations in brightness across the surface are removed by this process. This "color map" was then superposed over a clear-filter image.
The origin of the color differences is not yet understood, but may be caused by subtle differences in the surface composition or the sizes of grains making up the icy soil.
Wispy markings were seen on the trailing hemispheres of both Rhea and Dione in images taken by the Voyager spacecraft, and were hypothesized by some researchers to be the result of material extruded onto the surface by ice volcanism. Cassini’s earlier revelation of the braided fractures on Dione led to speculation that Rhea’s wisps might also be created by fractures.
This view shows terrain on the trailing hemisphere of Rhea (1,528 kilometers, 949 miles across). North is up.
The image was taken using the Cassini spacecraft narrow-angle camera on Jan. 17, 2006 at a distance of approximately 245,000 kilometers (152,000 miles) from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 30 degrees. Image scale is 1 kilometer (4,771 feet) per pixel.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate, Washington, D.C. The imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo.