NASA

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NASA has an app that’s also called NASA and which acts as a media hub for everything that’s related to the space agency. Read more about NASA  

NASA is a very active organization, and it has a ton of stuff available at any given point, including articles, images, videos, research papers, you name it. They also have an app that gathers everything under the same roof.
 
With the NASA app users can access everything that in the public domain, and that even includes tweets. People can check out the massive image library (more than 15,000), the latest news and stories, live feeds from various events, information on current NASA projects, visible passes for the International Space Station (ISS) and notifications, ISS and Earth orbiting satellite trackers, and even the schedule for NASA TV and NASA-related programming on other TV channels.