AstroPhotons compiles a collection of eye-catching images in one place, making an enjoyable viewing experience on various sizes of screens. The main features are as follows.

Overview - many pictures in one glimpse
Calendar - pictures of a specific month
Details - picture details with an explanation and keywords
Sharing - sharing the page/pdf of an awesome astronomy photo with friends
Widget - admiring a photo of a day, updating the photo every 30 minutes, and tapping the Widget to learn more.
Searching - doing research like a pro
Carousel - displaying a randomly selected photo every 10 seconds