Procedural Generated Galaxy

Hello,

searching the best way to make a procedural generated galaxy like this one :

http://www.infinity-universe.com/Infinity/index.php?option=com_content&task=view&id=106&Itemid=27

and define space, sun and planets with an impressive space / planet transition like this :

http://www.infinity-universe.com/Infinity/index.php?option=com_content&task=view&id=114&Itemid=49

any ideas ?

Thanks ^^

http://answers.unity3d.com/questions/tagged/procedural

http://www.google.com/search?hl=en&client=opera&hs=0T&rls=en&channel=suggest&sa=X&ei=TbedTceIOOWZ0QHI89HcBA&ved=0CBcQBSgA&q=procedurally+generated+unity3d&spell=1

To be honest, I don't know much about it, so I'd search around...

I did it already, that point me here and :

http://en.wikipedia.org/wiki/Level_of_detail http://en.wikipedia.org/wiki/Procedural_generation

http://answers.unity3d.com/questions/43176/procedural-planets

some explanations here (all posts) : http://www.infinity-universe.com/Infinity/index.php?option=com_content&task=blogcategory&id=0&Itemid=47

this can help too : http://entitycrisis.blogspot.com

Interesting example here : http://www.wow-zen.com/celestial/index.html from http://forum.unity3d.com/threads/59076-Programmer-scripter-looking-for-work.?highlight=galaxy+procedural

But if more ... Starting point or something else, I take it !