http://www.space.com/scienceastronom...ts_021210.html
Somewhere between reality and the unknown, science fiction has always flourished. The best sci-fi authors rigidly adhere to one principle: Make it as real as possible, given what's known. Now, as if lifting a chapter from an Isaac Asimov novel, NASA plans to create hundreds of "synthetic planets" that might represent real worlds orbiting faraway stars.
The cyber planets will be modeled on solid science, but the results are likely to be decidedly fantastic. No one knows what sort of worlds will be generated, and that's the whole point.