I believe it may have been Europa, or possibly a satellite observed in the Gleaus system, but there was liquid water observed elsewhere in otherwise freezing temperatures that was sustained through the satellite's host exerting fluctuating gravitational pressures that forced water up in geysers that shot several miles out from the poles, and what's more: they found traces of amino acids within the water For clarification, amino acids are the basic components that make up DNA. This means carbon based life like ourselves has a chance of developing given the proper conditions