Free : Nasa Astronomy Picture of the Day (Was $6.99) @ Microsoft
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This is free for 6 days.
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. View and save the pictures of the past dates. ALL ADD-ONS AND FUNCTIONALITY FREE FOR FIRST 4 USES. Make your desktop and lockscreen look mysterious and beautiful by setting the images displayed in the app as wallpapers.
After purchasing add-ons, you can also save the image and make it your wallpaper/background
