Is there an ocean in space?

I became interested in whether Jupiter's moon Europa has a sub-surface ocean. I wanted to compare the surface on Europa to frozen ice on Earth's oceans. You can get to the research paper if you click on the image of Europa below:

After this research I wanted to understand the mathematics behind combining two fractals so I took a fractal's class and the results are also posted under "super-imposing fractals" in this weblog.