NASA Saturn's Cool RIngs

I have this program on my mac called SpaceInBack that loads a new desktop picture in my iBook when I restart it. This am it loaded a really cool shot of Saturn's rings. I had no idea they varied in temps like this.



NASA - Saturn's Cool Rings







"This false-color image shows that the temperatures on the unlit side of Saturn's rings vary from a relatively warm 110 Kelvin (-261 degrees Fahrenheit, shown in red), to a cool 70 Kelvin (-333 degrees Fahrenheit, shown in blue). The green represents a temperature of 90 Kelvin (-298 degrees Fahrenheit). Water freezes at 273 Kelvin (32 degrees Fahrenheit)."