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A few years ago, astronomers began to wonder if any of the more than 4,000 exoplanets already discovered could resemble ice moons with subsurface oceans such as Enceladus or Europe orbiting gas giants in the solar system. Although both of these moons do not have their own atmosphere and are completely covered with ice crust, they are still the best places for seekers of extraterrestrial life in our planetary system. Geysers gushing from the surface of Europe and Enceladus indicate that under their surfaces are oceans of liquid water and, moreover, both of these objects have in themselves some source of energy that drives these geysers. These two elements: liquid water and an energy source are the basic two requirements for the creation of life as we know it – says the planetary scientist Lynnae Quick. If we assume that both of these moons may be conducive to the creation of life, then perhaps their larger counterparts in other planetary systems also conducive to the emergence of life...