2D physic simulation of the solar system and more

The goal of this project is to create a physics simulation soley in 2D. Thus, the project's name Planeworld :-)
It can be used to simulate the solar system...
Orbits of Mercure, Venus and Earth
and also space crafts can be modeled and controled using the integrated Lua interface:
Rocket with thrusters controled using Lua
Rocket starting into the space

View on GitHub

I hope you recognized the fancy paralax scrolling of the background. It is purely achieved with CSS and without JavaScript. The idea is taken over from the blog post of Keith Clark.
The cool Planeworld logo is implemented by using some JavaScript. The main logic of the animation is embeded within the SVG file and was created using Inkscape.