If you're fan of Arthur C. Clarke's work, you may recall how in his novel, 2010: Odyssey Two, an alien species turned Jupiter into a new star. In so doing, Jupiter’s moon Europa was permanently terraformed, as its icy surface melted, an atmosphere formed, and all the life living in the moon’s oceans began to emerge and thrive on the surface. However, turning Jupiter into a star is not exactly doable (not yet, anyway). However, there are several proposals on how we could go about transforming some of Jupiter’s moons in order to make them habitable by human beings. In short, it is possible that humans could terraform one of more of the Jovians to make it suitable for full-scale human settlement someday. http://www.universetoday.com/128530/how-do-we-terraform-jupiters-moons/
Interesting article. All rather difficult to achieve, but given time, and if we are able to continue to survive for a few thousand years.........who knows?