I created this simulation of a black hole solely with Gemini 3

It uses Volumetric Ray Marching to render the accretion disk and implements relativistic gravitational lensing to bend light around the event horizon. The disk density uses a Gaussian falloff to avoid artifacts, and the starfield is mapped spherically to stabilize the background.

Edit:

For those who are interested: I made a newer version with the doppler color shift applied. You can watch it here: https://youtube.com/shorts/ds39YTcRMxM?si=PBPslUjExDTnCw4c

You can look at it yourself in Visual Studio Code, by copying the code from here: https://pastebin.com/u/InfiniteNeonAbyss/1/7ThPFCVX