The Space Photo app does not collect or use any of your personal data.
The Space Photo app does allow the user to save images and videos for later viewing within the app. The dates of these specific images and videos are saved locally on the device to allow the app to display the favorites when requested.
The Space Photo app does link to external resources such as NASA's Astronomy Picture of the Day website and uses external links to access the relevant images and videos for the dates requested by the user within the app.