Titan is Saturn’s largest moon. With an atmosphere about twice as thick as Earth, but much colder (the average temperature on the surface is around minus180 Celsius—approaching 300 below in Fahrenheit), life on as we know it on Earth would seem to be impossible on Titan. Liquid water forms the common solvent of all life on our planet, of all sizes, for plants, animals, bacteria, and everything else. On Titan, water is a rock as much as slate is on our world. As on Earth, internal heating can cause the rock to melt—but on Titan, this would mean that liquid water would flow as a cold version of lava, only to solidify again into water rock. On the surface, no life could exist that depends on liquid water. It could be that if there is a permanent reservoir of molten water under the surface of Titan, just as there is a permanent flow of magma under the surface of the Earth. If so, liquid-water based bacteria might live below. That perhaps could be, but what interests me is the possibili
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