The disk's color runs from near-white heat at the inner edge to deep orange at the rim, and a field of background stars gives the scene depth.
Black Hole 3D Visualizer
Tens of thousands of glowing particles orbit the black event-horizon sphere, and the inner ones circle faster - the same reason real accretion disks shear and heat up.
The facts panel carries real figures - Sagittarius A* at about 4.3 million solar masses in our galaxy's center, M87* at about 6.5 billion (the first black hole ever imaged), and the rule of thumb of roughly 3 km of event-horizon radius per solar mass.
The page is honest about what it is - an artistic, educational approximation that does not solve general relativity; the numbers are real, the visuals are art.
Drag to orbit the camera, scroll or pinch to zoom, and click for a full-screen view with the facts panel still readable; phones automatically get a lighter particle count for smooth motion. One physics detail this scene does not attempt: a real black hole bends passing light into a bright photon ring and warps the far side of its disk into view above and below the event horizon (gravitational lensing) - this visualization only hints at that effect and does not compute it, so the disk and background stars you see stay undistorted.
For a step-by-step walkthrough of the controls and the physics facts, read the Black Hole 3D Visualizer step-by-step guide. The Space 3D collection also includes a Solar System 3D Explorer and a Galaxy 3D Simulator.
How the controls and device tiering keep the scene smooth on any screen
The particle count is not fixed - a desktop draws the full 32,000-particle accretion disk, while a phone drops to 12,000 so the motion stays fluid instead of stuttering on weaker mobile GPUs. That budget matters because each particle is re-positioned every frame along an orbit whose speed scales roughly as one over the radius to the 1.5 power, so the innermost ring visibly races while the rim drifts, and doubling the count on a phone would trade that smoothness away for detail no small screen resolves anyway. Camera control is direct manipulation rather than a menu: drag to orbit around the event horizon, then scroll on a mouse or pinch on a touchpad or phone to zoom in on the near-white inner edge. Clicking the full-screen control expands the WebGL canvas across the whole window while keeping the facts panel with the Sagittarius A* and M87* figures readable in the corner, so you never lose the numbers when you go big. If your device has no WebGL2 support the scene shows a plain notice instead of a black rectangle, which is the honest fallback for the small share of browsers that cannot render it.
Frequently Asked Questions
What am I looking at?
Tens of thousands of glowing particles orbit the black event-horizon sphere, and the inner ones circle faster - the same reason real accretion disks shear and heat up.
Is this a real physics simulation?
The page is honest about what it is - an artistic, educational approximation that does not solve general relativity; the numbers are real, the visuals are art.
What real figures does the panel include?
The facts panel carries real figures - Sagittarius A* at about 4.3 million solar masses in our galaxy's center, M87* at about 6.5 billion (the first black hole ever imaged), and the rule of thumb of roughly 3 km of event-horizon radius per solar mass.