We are not alone, at least not where planets are concerned. Although not all of the solar family is currently included in this collection, there is plenty of company to choose from.
To set image as wallpaper, click on thumbnail to bring up full size image in separate window, then right click on full size image to bring up a little menu, choose "Set as wallpaper..." from menu (in Internet Explorer). If you have a Windows 98 or later OS on your computer, you should be able to use the "stretch" option to compensate for the difference between your screen resolution size and the picture size, if one exists. Most pictures were kept at the largest reasonable resolution size to preserve the image quality.
toddmckinney.com