How does the Black hole close to you looks like ? Real simulation on a camera.
Requires only access for the camera and the SD card (to save high-resolution photos), nothing more. You can revoke the SD card access - it will be still usable, although with limited functionality. Number of ads = 0.
It is still on progress, I yet have to test on different-vendor phones and improve the 15 different translations - right now nearly all of them are generated by on-line auto translators which is far from perfect.
Credit for the "Black holes in fiction" article on the wikipedia for an image on a Creative commons licence.
Opening of the picture folder from within the app, might require some File Explorer App in the system.
Requires 32-bit floating point precision on GPU to render preview correctly.