The NASA App (Free - no IAP) is an information based application that can help astronomers be more aware of NASA's current activities, such as missions and the locations of satellites.
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Pro Updated daily
The NASA app has tons of information, most of which is updated constantly.
Pro A huge selection of content
Has over 14,000 images with more added regularly. In addition to images, this app also offers articles videos, TV feeds, and radio in order for users to get the most out of their viewing experience.
Pro Informs users of missions
The Missions calendar lets people see launch schedules and viewing opportunities based on current location. Countdown clocks are included for more precise timing.
Con Not much info on celestial bodies
While this app gives users a ton of information on NASA's activities, it doesn't provide useful information for stars.