Uranus would be a fascinating planet to visit, but living there would be extremely difficult. However, its moons are a different story. In all, Uranus has 27 known moons, and its five largest satellites are often considered its "major moons." If we wanted to set up permanent bases on Uranus's satellites, Titania and Miranda are great targets — Titania presents the strongest gravity (almost 4 percent of Earth's), and Miranda has a surface ripe for exploration. Because Voyager 2 is the only spacecraft to visit the Uranus system, Earthlings still don't know much about the planet's moons.