Created by Julian Garnier, it shows the eight planets orbiting the sun in 3D (yes, you read that right - despite what you got told at school, boffins recently decided that Pluto is no longer officially a planet).
How to view it
Because the demo uses modern CSS3 properties, it won't work well (or at all) in many older browsers.
We found it flew in Chrome; in the words of its creator, the model "works better in webkit", is "buggy" in Firefox, and "flat" in Internet Explorer.
When you visit the page, the screen is split into two. Drag the bar up if you want to see the full code, or down if you want to see the solar system in all its glory.
Simple controls appear on the right-hand side to increase and reduce the speed of the model, and switch between 2D and 3D views.
Shoulders of giants
Have you seen a cool CSS demo? Tell us about it in the Comments!