sentences:  There is, of course, no guarantee that the other conditions will be found that allow liquid water to be present on a planetary surface.Should planetary mass objects be present, a single, gas giant planet, with or without planetary mass moons, orbiting close to the circumstellar habitable zone, could prevent the necessary conditions from occurring in the system.However, it would mean that planetary mass objects, such as the icy bodies of the solar system, could have abundant quantities of liquid within them.