Astronomy Picture of the Day is a feed created by NASA that let's you see what amazing depths of space that they are exploring. NASA does not even just give you a high resolution photo that you can navigate around using the iPhone. They also give you a detailed explanation as what you are seeing.
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The National Aeronautics and Space Administration (NASA, pronounced) is an agency of the United States government, responsible for the nation's public space program. NASA was established on July 29, 1958, by the National Aeronautics and Space Act.