Show HN: Physically accurate black hole you can put in your room | Hacker News

A Harvard astrophysicist launched a browser app that simulates a physically accurate black hole with relativistic ray tracing.

Users can view it on a normal screen or place it in AR/VR via WebXR, including on Chrome for Android.

The app shows real effects like Doppler boosting and lensing, making black hole physics easier to explore interactively.

It requires no signup and does not upload camera data to a server, which helps privacy and accessibility.

The project supports education and outreach by bringing advanced astrophysics to everyday consumer devices.