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The Cartwheel Galaxy
Located 500 million light-years away in the constellation Sculptor, the galaxy looks like a wagon wheel. The galaxy's nucleus is the bright object in the center of the image; the spoke-like structures are wisps of material connecting the nucleus to the outer ring of young stars. The galaxy's unusual configuration was created by a nearly head-on collision with a smaller galaxy about 200 million years ago.
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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Galaxies