3d game/physics engine

[Sisyphus]

   Hello, I am new to programming in java and I am trying to create a 3d game engine. But I have no clue where to start, aside from the over all theoretical designs. This will just be an experiment to practice for an actuall game I have planed, the engine (and the programm) will consist of a model of the solar system (to be simple the planets are just different colored balls). Each planet will have to have a mass, rotation speed, orbit speed, specific gravity, cast shadows (for eclipses), and has to have an orbital distance from the sun.
   All I need is for someone to explane how to create this small model, examples will be appreciated. If someone does want to make an example than all I need is the skeleton programm e.g. the values for masses and the like dont have to be filled in. As long as there is commentary to show me where to fill in those values. If someone want the values anyways simply let me know and I will post them. Any and all help is apreciated.

[arne]

Don't create a 3d-engine, because then you will never get to making your game!!

3d-engines you could use:
higher API's:
xith-3d
jMe

lower API's:
jogl
lwjgl

[Sisyphus]

   Thanks I didn't know about those.