Earth, Sun and other stars...
Built this in a day experimenting with Paper.js
Paper.js — The Swiss Army Knife of Vector Graphics Scripting.
Paper.js is an open source vector graphics scripting framework that runs on top of the HTML5 Canvas. It offers a clean Scene Graph / Document Object Model and a lot of powerful functionality to create and work with vector graphics and bezier curves, all neatly wrapped up in a well designed, consistent and clean programming interface.