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Young and Old Stars Found in Andromeda's Halo
The deepest visible-light image ever taken of the sky resolves approximately 300,000 stars in the halo of the nearest neighboring spiral galaxy, Andromeda (M31). The halo is a spherical cloud of stars around Andromeda, located 2.5 million light-years from Earth.
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