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The new NASA iPhone app means that even when you are away from your computer (or telescope), you can gawk at nebulas and sunspots. NASA’s image-of-the-day and astronomy-photo-of-the-day collections are right there in searchable thumbnail grids. (We like the “nebula” and “mass ejection” searches.) Plus, you can e-mail or save them to your phone. It’s hard to think of a better way to get nerdy/sublime backgrounds than this app.