Terraforming Jupiter is the proccess of building an artificial surface above the atmosphere and making a new, life supporting biosphere. The super strong artificial surface would be built at a distance from Jupiter's 'suface' where the gravity is about 9.8 m/s^2, and given an Earth-like atmosphere and temperatures. The low altitudes will be covered with vast oceans while the higher altitudes will be continents and islands. Doing this would involve massive amounts of power and resources, so this would be done in the far future.
- Theoretically, any gas giant could be enclosed in a solid shell; at a certain radius the surface gravity would be terrestrial, and energy could be provided by tapping the thermal energy of the planet.