URL：http://astronomyonline.org/SolarSystem/Images/Saturn/SaturnIRImagePoleActivity.jpg
掲載元：http://astronomyonline.org/ViewImage.asp?Img=/SolarSystem/Images/Saturn/SaturnIRImagePoleActivity.jpg&Cpt=Active spots in the polar regions of Saturn are of unknown origin, but may be hot methane clouds.
