Space Image of the day by NASA. Dropbox Add file from URL.

Set NASA's Image of the Day as your wallpaper

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Once you get NASA's Image of the Day delivered to your Dropbox every day, follow the simple instructions in this lifehacker post to set Dropbox as your wallpapwer source: http://lifehacker.com/build-an-instagram-powered-wallpaper-rotator-with-dropb-509626800