Saturn's biggest moon, Titan, is one of the few viable places humans can explore first-hand beyond Mars. It's relatively safe from radiation, it's covered in liquid (though not water) and otherwise relatively safe. But could more than a handful of people even stay there for very long? Apparently, the answer is yes. Researchers have conducted a study showing that Titan should have enough energy to sustain a colony. The first arrivals might have to build a nuclear power plant and take advantage of radioactive decay, but colonists could use the abundance of hydrocarbon lakes to generate power by combining hydrogen with acetylene (which should also be plentiful). And since Saturn creates strong tides, you could use turbines to generate plenty of electricity.