APOD 1.3 September 14th

This picture details the atmosphere of Iapetus, one of Saturn's moon. I didn't know there could be different colors of atmosphere, and was surprised that it's common knowledge that Iapetus has dark (looks black) atmosphere and light (looks white) atmosphere. The planet's organic ice-dense composition is probably the cause for the atmosphere, and the dark terrain was named after a guy named Cassini Regio. Its really interesting to know that atmosphere can vary like that on the same planet.