Our new composition system, including eight new materials, like oxygen and methane, is still in active development and has not been released, but you can opt-in to a preview version now on Steam. These materials are transferred to the Moon’s surface, forming lakes that flow together and eventually evaporate to create an atmosphere. The Moon is bombarded with asteroids made of carbon dioxide, sulfur dioxide, methane, and water. We plan to simulate the colors of hazes like those in Titan’s atmosphere in the future. The color of Titan’s atmosphere is not fully simulated because they are caused by tiny amounts of organic particles called tholins that are not simulated in Universe Sandbox.Materials transferred during collisions are currently always transferred in the liquid phase (although they can change phase quickly after being transferred).Materials in small asteroids do not undergo phase changes.Phase changes (like evaporation) do not affect the surface temperature of an object.Computing planet radii from their composition does not take into account the object’s surface temperature (so heating a gas giant won’t make it expand, for example).The maximum speed liquids and gases can flow across object surfaces is slower than the maximum speed of material phase changes and simulation speed.Add the ability to easily replace one material with another.Better explanation of the Composition cutaway view.Updated Atmosphere Preset selection interface.Viewing materials as a percentage of the mass.Planning updates to the materials interface, including:.Materials not simulated across the surface of objects do affect their atmospheric heating, but do not affect the atmosphere opacity.When a new material replaces one of the 4 simulated materials, it is evenly distributed over the surface, which can cause an atmosphere to seemingly “pop” into existence. We plan to increase the number of materials simulated on object surfaces in the future.
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