Originally posted by Lt.Khrys Antos
Maybe the idea of a large planet is too far fetched for what I have in mind.
Well, it's not.
If you'd like, you can have Jupiter made out of Cream Cheese and populated by Oompa-Loompas, as long as you and your players are entertained, Science be damned. 
Now I've got lots of good competing ideas;
a world ripped out of its orbit and dying slowly in space,
one artificial planet which "flies" through space,
and one which is a ocean based which was purposefully torn out of its orbit.
All great ideas, I'm trying to figure a way to merge them all together. Some help would be appreciated in trying to put them together.
I've got it! Two Words:
"Rogue System"
If you give a monkey control over it's environment, it will fill the world with bananas, and whereas that is a great accomplishment, it's still a very stupid thing to do. --Doctor Who #2