The new Stock Windows 7 Build 7232 1920x1080 HD Wallpaper, High Definition Background.
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As far as galaxies are concerned, size can be deceptive. Some of the largest galaxies in the Universe are dormant, while some dwarf galaxies... -
Chandra data show the supermassive black hole at the center of NGC 5813 has erupted multiple times over 50 million years. NGC 5813 is a grou...
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