Translations:Atmosphere/5/en

UWP & Atmospheres

The third digit in the UWP identifies the type of atmosphere that the world has. As a rule, only larger worlds have a gravitational field large enough to hold on to an atmosphere, but there certainly are exceptions. An atmosphere is essentially a layer of gas or gasses that cloak the surface of the planet and there are a number of reasons why a world may or may not be lucky enough to have one. As we have already mentioned, a big world has the muscle to keep its atmosphere and the bigger the world, in all likelihood the denser (...or thicker) the atmosphere will be. Conversely, moons and small planets with relatively low surface gravities will generally have only trace atmospheres, if they have anything at all.