How would be the life in a Jupiter's or Saturn's satellite?

Jupiter's inner moons seem unlikely. The planet's gigantic magnetic and radiation fields extend outwards in a huge torus that takes in the orbital plane of many of the larger moons. This radiation would prove extremely damaging - both to life itse... read more

The Sun is only 4% as bright at Jupiter and 1% as bright at Saturn, as at Earth. Jupiter has a large and powerful magnetosphere and radiation belts, though Ganymede has its own magnetosphere that protects its equatorial region from energetic particles, though not the poles. read more

The European-American Cassini spacecraft has found that three of Saturn's many moons likely host subsurface oceans and may be capable of supporting life. read more

Given the general planet-to-satellite(s) mass ratio of 10,000, large Saturn or Jupiter sized gas planets in the habitable zone are thought to be the best candidates to harbour Earth-like moons. read more