The Centre for Exoplanets and Habitability convenes a Postgraduate module, "Habitability in the Universe", which is run by the Institute for Advance Teaching and Learning. This module is open to all postgraduates, from all disciplines, and covers the subject of habitability from myriad perspectives. More details can be found on the module's home page.
Data from NASA's Cassini satellite has shown that Saturn's moon Enceladus harbours a sub-surface, salty ocean. After multiple flybys of Saturn's moon Enceladus, including one that passed through the plume of material being ejected from the moon, the various instruments on Cassini have given NASA enough information to confidently claim the existence of this ocean, and to speculate that there may even be hydothermal vents on the ocean's floor.