RE: the ice thing, every system has a dew line which is defined as the distance from the star or stars in the system where water in the solar wind that encounters a solid body that is at a temperature that is low enough that it's energy released upon impact still not enough to be above 0 degrees C. The water in the solar wind sticks to the object at a faster rate than the water gets knocked off. There are other distances for other species of materials in the solar wind (CO2, CH4, O2, H2, and so on) OOT cloud objects gets all species of materials sticking to them. How far out you have to go to get water ice depends on what spectral class the stars in the system are.