Maybe you've come across this on the news today, first asteroid on the Solar System discovered with a ring around it. I created this simple scene for the press release using Terragen.
(http://www.eso.org/public/archives/images/screen/eso1410a.jpg)
Here's a video podcast about it
and the full news release if you guys wanna know more about it. http://www.eso.org/public/news/eso1410/
Cheers
(edit: only the surface was created in Terragen, the other orbital views were created in C4D)
Looks great! And thanks for the link to the story, I did not hear about this 8) Very nice background too.