Onward to Europa
The oceans of Jupiter’s ice worlds might be swimming with life — so why do we keep sending robots to Mars?
If Europa is alive, if some biology dwells within those dark waters, the implications would be even more staggering than finding life on Mars. Our gaze would turn to Jupiter’s Ganymede next, and to Callisto, along with Saturn’s Titan and Enceladus, and perhaps even the dwarf planets such as Ceres and Pluto, all of which also likely harbour substantial subsurface reservoirs, heated through some combination of tides and radioactive decay. (via It’s time to look for life in Europa’s ocean – Lee Billings – Aeon)