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Saturn
The delicate color variations in the clouds are due to smog in the upper atmosphere, produced when ultraviolet radiation from the Sun shines on methane gas. Deeper in the atmosphere, the visible clouds and gases merge gradually into hotter and denser gases, with no solid surface for visiting spacecraft to land on.
Internet Explorer users
Right Click on the image and select Set as Background.
Netscape Navigator users
Right Click on the image and select Set as Wallpaper.
Mac users
Hold down the mouse button over the image and wait for the menu.
Choose Save Image As.
Open the control panel to Desktop Pictures.
Click Select Picture and load the file you just saved.
Choose Position Automatically.
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Saturn